Very simply off the top of my head, sanctification might be called a process of becoming holy, of being set apart by God. Is it not the growth process as per the John 3:30 verse quoted already?
Joh 3:27 John answered and said, A man can receive nothing, except it be given him from heaven.
Joh 3:28 Ye yourselves bear me witness, that I said, I am not the Christ, but that I am sent before him.
Joh 3:29 He that hath the bride is the bridegroom: but the friend of the bridegroom, which standeth and heareth him, rejoiceth greatly because of the bridegroom's voice: this my joy therefore is fulfilled.
Joh 3:30 He must increase, but I must decrease.
Joh 3:31 He that cometh from above is above all: he that is of the earth is earthly, and speaketh of the earth: he that cometh from heaven is above all.
Joh 3:32 And what he hath seen and heard, that he testifieth; and no man receiveth his testimony.
Joh 3:33 He that hath received his testimony hath set to his seal that God is true.
Joh 3:34 For he whom God hath sent speaketh the words of God: for God giveth not the Spirit by measure unto him.
Joh 3:35 The Father loveth the Son, and hath given all things into his hand.
Joh 3:36 He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
John 3.30 in context, nothing to do with sanctification
1 Timothy 4:5
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for it is sanctified by means of the word of God and prayer.
John 17:17
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Sanctify them in the truth; Your word is truth.
1 Thessalonians 4:7
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For God has not called us for the purpose of impurity, but in sanctification.
1 Thessalonians 4:3
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For this is the will of God, your sanctification; that is, that you abstain from sexual immorality;
1 Thessalonians 4:4
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that each of you know how to possess his own vessel in sanctification and honor,
Hebrews 10:10
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By this will we have been sanctified through the offering of the body of Jesus Christ once for all.
1 Corinthians 1:30
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But by His doing you are in Christ Jesus, who became to us wisdom from God, and righteousness and sanctification, and redemption,
Hebrews 12:14
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Pursue peace with all men, and the sanctification without which no one will see the Lord.
1 Corinthians 6:11
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Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God.
2 Chronicles 7:16
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For now I have chosen and consecrated this house that My name may be there forever, and My eyes and My heart will be there perpetually.
2 Thessalonians 2:13
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But we should always give thanks to God for you, brethren beloved by the Lord, because God has chosen you from the beginning for salvation through sanctification by the Spirit and faith in the truth.
Acts 20:32
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And now I commend you to God and to the word of His grace, which is able to build you up and to give you the inheritance among all those who are sanctified.
Ezekiel 20:12
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Also I gave them My sabbaths to be a sign between Me and them, that they might know that I am the Lord who sanctifies them.
Romans 15:16
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to be a minister of Christ Jesus to the Gentiles, ministering as a priest the gospel of God, so that my offering of the Gentiles may become acceptable, sanctified by the Holy Spirit.
2 Corinthians 7:1
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Therefore, having these promises, beloved, let us cleanse ourselves from all defilement of flesh and spirit, perfecting holiness in the fear of God.
1 Corinthians 7:14
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For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her believing husband; for otherwise your children are unclean, but now they are holy.
1 Thessalonians 5:23
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Now may the God of peace Himself sanctify you entirely; and may your spirit and soul and body be preserved complete, without blame at the coming of our Lord Jesus Christ.
Leviticus 20:7
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You shall consecrate yourselves therefore and be holy, for I am the Lord your God.
John 10:36
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do you say of Him, whom the Father sanctified and sent into the world, ‘You are blaspheming,’ because I said, ‘I am the Son of God’?
Ephesians 5:26
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so that He might sanctify her, having cleansed her by the washing of water with the word,
1 Corinthians 1:2
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To the church of God which is at Corinth, to those who have been sanctified in Christ Jesus, saints by calling, with all who in every place call on the name of our Lord Jesus Christ, their Lord and ours:
Hebrews 13:12
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Therefore Jesus also, that He might sanctify the people through His own blood, suffered outside the gate.
Hebrews 10:14
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For by one offering He has perfected for all time those who are sanctified.
1 Peter 1:2
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according to the foreknowledge of God the Father, by the sanctifying work of the Spirit, to obey Jesus Christ and be sprinkled with His blood: May grace and peace be yours in the fullest measure.
Acts 26:18
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to open their eyes so that they may turn from darkness to light and from the dominion of Satan to God, that they may receive forgiveness of sins and an inheritance among those who have been sanctified by faith in Me.’
2 Timothy 2:21
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Therefore, if anyone cleanses himself from these things, he will be a vessel for honor, sanctified, useful to the Master, prepared for every good work.
Isaiah 13:3
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I have commanded My consecrated ones,
I have even called My mighty warriors,
My proudly exulting ones,
To execute My anger.
Exodus 29:37
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For seven days you shall make atonement for the altar and consecrate it; then the altar shall be most holy, and whatever touches the altar shall be holy.
Joshua 3:5
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Then Joshua said to the people, “Consecrate yourselves, for tomorrow the Lord will do wonders among you.”
Joel 2:16
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Gather the people, sanctify the congregation,
Assemble the elders,
Gather the children and the nursing infants.
Let the bridegroom come out of his room
And the bride out of her bridal chamber.
Matthew 23:19
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You blind men, which is more important, the offering, or the altar that sanctifies the offering?
John 17:19
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For their sakes I sanctify Myself, that they themselves also may be sanctified in truth.
Genesis 2:3
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Then God blessed the seventh day and sanctified it, because in it He rested from all His work which God had created and made.
Exodus 29:44
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I will consecrate the tent of meeting and the altar; I will also consecrate Aaron and his sons to minister as priests to Me.
Hebrews 2:11
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For both He who sanctifies and those who are sanctified are all from one Father; for which reason He is not ashamed to call them brethren,
Romans 1:4
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who was declared the Son of God with power by the resurrection from the dead, according to the Spirit of holiness, Jesus Christ our Lord,
Romans 6:19
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I am speaking in human terms because of the weakness of your flesh. For just as you presented your members as slaves to impurity and to lawlessness, resulting in further lawlessness, so now present your members as slaves to righteousness, resulting in sanctification.
1 Timothy 2:15
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But women will be preserved through the bearing of children if they continue in faith and love and sanctity with self-restraint.
Hebrews 10:29
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How much severer punishment do you think he will deserve who has trampled under foot the Son of God, and has regarded as unclean the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace?
Isaiah 8:13
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“It is the Lord of hosts whom you should regard as holy.
And He shall be your fear,
And He shall be your dread.
Isaiah 29:23
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But when he sees his children, the work of My hands, in his midst,
They will sanctify My name;
Indeed, they will sanctify the Holy One of Jacob
And will stand in awe of the God of Israel.
Matthew 23:17
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You fools and blind men! Which is more important, the gold or the temple that sanctified the gold?
Exodus 13:2
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“Sanctify to Me every firstborn, the first offspring of every womb among the sons of Israel, both of man and beast; it belongs to Me.”