1 Corinthians 15:24 (MEV): Then comes the end when He will deliver up the kingdom to God the Father, when He puts an end to all rule and all authority and power.
The time will come when all rule, authority and power will end. This is a reference to the demonic kingdom that works behind the scenes of the governments and authorities in this world. Those powers are used to subdue and enslave people.
When Jesus delivers up the kingdom to God, it is freely done. Those that are of the kingdom have freely chosen to be a part of it.
Yet for those who oppose Him and the kingdom, those will be subdued.
1 Corinthians 15:25 (MEV): For He will reign until He has put all enemies under His feet.
There is also an end to death. Death was introduced into this world by interference from those demonic powers.
1 Corinthians 15:26–27 (MEV): The last enemy that will be destroyed is death. For He “has put all things under His feet.” But when He says, “all things are put under Him,” it is revealed that He, who has put all things under Him, is the exception.
Paul changes the focus slightly. Jesus is portrayed as the conquering hero, and the One Who put an end to the enemies of God. Yet here Paul is pointing out His position still as a Servant doing the bidding of God. It’s not that Jesus is a lower or lesser part of God. He has placed Himself in the role of Servant. As such the One He serves has placed all things under Jesus.
1 Corinthians 15:28 (MEV): When all things are subjected to Him, then the Son Himself will also be subject to Him who put all things under Him, that God may be all in all.
There we have it. That God may be all in all. That is, the Godhead is above all things… The kingdom is given to God, enemies are the footstool of Jesus. There will be no other power or authority but God Himself.