Hebrews 2:5-8: 5 For He did not subject to angels the world to come, about which we are speaking. 6 But someone has testified somewhere, saying, “What is man, that You think of him? Or a son of man, that You are concerned about him? 7 You have made him for a little while lower than angels; You have crowned him with glory and honor; 8 You have put everything in subjection under his feet.” For in subjecting all things to him, He left nothing that is not subject to him. But now we do not yet see all things subjected to him.

In Hebrews chapters 1-2, the Apostle Paul uses Old Testament scriptures to describe four different groups, each with their own characteristics and planes of existence. These groups are the glorified Jesus, the church, the angels and mankind. It is true that Jesus, having sacrificed his human life to redeem mankind (Matthew 20:28), was glorified to the divine nature (Acts 1:9) and will thus never appear as a man again. It is also true that those on the human plane cannot mix with those on the divine plane (John 1:18). It is further true that Jesus rules not as a man, but as a divine being.

Hebrews 2:5-8, however, do not refer to Jesus, but to mankind. Verse 5 discusses the subjection, or dominion, of the earth and how that the future dominion of the earth (“the world to come”) will not be under the angels. Verses 6-8 instead focus on mankind. Verses 6, 7 and the first sentence of verse 8 cite Psalms 8:4-6. The verses describe the nature of man as originally created by God. Adam, and through him, his descendants, were granted dominion over the earth by God (Genesis 1:26). This dominion was lost when Adam disobeyed God’s commandment (Genesis 3:6). Through the redemptive power of Jesus’ sacrifice (1 Corinthians 15:22), mankind will be restored to their lost state of perfection. At that time, dominion over the earth will be restored to mankind. In the last sentence of Hebrews 2:8, Paul explains that this restoration is a future event and has not occurred yet. 

Additional Resource:
Christian Questions Podcast
Episode #1100: “Do People Turn Into Angels When They Die?”
Establishing spiritual and human natures as separate and distinct
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CQ Rewind Show Notes