MY POV, is the 1000 year is ongoing continually in heaven with the departed saints ruling with Christ there, where He is right now at the Father's right hand, and that is where He will stay until the return.
There is nothing, ZERO, in Rev 20 that tells us where this rule is taking place. Nothing mentioned about on Earth.
How could Christ depart from the right hand of the Father and rule an earthly 1000 year kingdom??
He can't or the scripture is false, and Jesus said, scripture cannot be broken.
The 1000 years is symbolic of a long unknown time to us, cause we do not know when is the return of Christ.
But I know scripture in Acts 3 says heaven must hold Christ until the time of the restoration of all things, and for me that points to when God says in Rev 21 "Behold, I make all things new"
Christ also does not depart the Father's side at His right hand till all enemies are put under His feet, and we are told the last enemy to be destroyed is death when it is cast in the lake of fire.
In truth, when Christ returns, the Father is with Him still.
Which makes good sense as the last enemy, death, is still to be destroyed in a near future, after His coming again, after the Day of judgment.
Exodus 15:6
“Your
right hand, O Lord, has become glorious in
power; Your
right hand, O Lord, has dashed the enemy in pieces.
Luke 22:69
Hereafter the Son of Man will sit on the
right hand of the
power of God.”
1 Peter 3:22
who has gone into heaven and is at the
right hand of God, angels and authorities and
powers having been made subject to Him.
Matthew 26:63-65
New King James Version
63 But Jesus kept silent. And the high priest answered and said to Him, “I put You under oath by the living God: Tell us if You are the Christ, the Son of God!”
64 Jesus said to him, “It is as you said. Nevertheless, I say to you, hereafter you will see the Son of Man sitting at the right hand of the Power, and coming on the clouds of heaven.”
65 Then the high priest tore his clothes, saying, “He has spoken blasphemy! What further need do we have of witnesses? Look, now you have heard His blasphemy!
Acts 2:33-35
New King James Version
33 Therefore being exalted [a]to the right hand of God, and having received from the Father the promise of the Holy Spirit, He poured out this which you now see and hear.
34 “For David did not ascend into the heavens, but he says himself:
‘The Lord said to my Lord,
“Sit at My right hand,
35 Till I make Your enemies Your footstool.” ’