You hit others without success on this. Do you suppose my answer will change anything?
The only time I ever embraced the Trinity doctrine was when I was a sincere but very ignorant Catholic who thought he knew a lot. Now I know enough to recognize there are so many gaps in my knowledge.
Jesus spoke of the two greatest commandments:
"Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
This is the first and great commandment.
And the second is like unto it, Thou shalt love thy neighbour as thyself.
On these two commandments hang all the law and the prophets." Matt 22:37-40
Is knowledge of the nature of God contained in those two commandments as a something we must know for some reason? I really don't believe so and while it may be a good thing to know something about the nature of God, how essential is it to our pleasing Him?
No, I haven't been even a wishy washy trinitarian since I received the baptism of the Holy Ghost in 1976.
If there is a Trinity then there must also be a Multiplicity if Jesus' prayer is at least the "fervent prayer of a righteous man" which avails much [ James 5:16 ].
Consider his prayer here:
"Neither pray I for these alone, but for them also which shall believe on me through their word;
That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.
And the glory which thou gavest me I have given them; that they may be one, even as we are one:
I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me." John 17:20-23
As to the deity of Jesus I consider what these verses say:
"Being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they.
For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son?
And again, when he bringeth in the firstbegotten into the world, he saith, And let all the angels of God worship him.
And of the angels he saith, Who maketh his angels spirits, and his ministers a flame of fire.
But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom" Heb 1:4-8
And then also consider what Joseph became to Pharaoh in Egypt:
Was not Jesus is at least as much God to his Father as Joseph was god to Pharaoh?
"Thou shalt be over my house, and according unto thy word shall all my people be ruled: only in the throne will I be greater than thou." Gen 41:40