ANSWER: To answer your question we first need to briefly cover God's purpose for our life and everyone else.
Paul tells us that God will ultimately place ALL things under man (see Hebrews 2). The apostle John then tells us quite plainly that when we are resurrected from the dead we will be JUST LIKE Jesus in his glorified form. In short, God's purpose for man is to reproduce Himself in him - to give him the same character he has had for eternity. He has no plans to place angels, though righteous, over the new world he will soon build.
And, when we have that character, God will bring to the full his promise to make us rulers over all things (Hebrews 2:8).
1 See how much the Father has loved us! His love is so great that we are called God’s children . . . but it is not yet clear what we shall become. But we know that when Christ appears, WE SHALL BE LIKE HIM (1John 3)
God cannot give any greater gift than to give everything He is and literally everything his has. All that God is and has he wants to give to humanity to share in His total joy. What a loving Father! But first, he wants us to develope the character in order to properly enjoy his riches for all eternity. Now, what do we do as individuals as far as our part? First, we can recognize that Jesus stated we are to be witnesses of him to all people (Acts 1:6-8).
Our part is to live like Jesus, be like Him, act like Him and talk like Him. In the same way that the Father and Son are one, Jesus prayed just before he was crucified that we become one with THEM. He repeatedly as God the Father to make it possible that they, with true believers, are one.
21. That they all may be one, even as You, Father, are in Me, and I in You; that they also may be one in Us, in order that the world may believe that You did send Me. 22. And I have given them the glory that You gave to Me, in order that they may be one, in the same way that We are one: 23. I in them, and You in Me, that they may be perfected into one; and that the world may know that You did send Me, and have loved them as You have loved Me (John 17: 21 - 23).
By being one with Christ and Christ is one with the Father, then we are also one with the Father. When this becomes fully realized then God's grand purpose of reproducing Himself will be fulfilled! And how do we know if we are like Jesus and are living life as he wants us too? John, again, made this very plain.
34. A new commandment I give to you: that you love one another in the same way that I have loved you (John 13)