The final destiny of humanity is in the New Heaven and New Earth where it will dwell eternally in the kingdom of God.
“And
I perceived a New Heaven and a New Earth, for the former heaven and the former
earth pass away, and the sea is no more. And I perceived the holy city, New
Jerusalem, descending out of heaven from God, made ready as a bride adorned for
her husband. And I hear a loud voice out of the throne saying, "Lo! the
tabernacle of God is with humanity, and He will be tabernacling with them, and
they will be His peoples, and God Himself will be with them. And He will be
brushing away every tear from their eyes. And death will be no more, nor
mourning, nor clamor, nor misery; they will be no more, for the former things
passed away. And He Who is sitting on the throne said, "Lo! New am I
making all!" And He is saying, "Write, for these sayings are faithful
and true." And He said to me, "I have become the Alpha and the Omega,
the Origin and the Consummation. To him who is thirsting I shall be giving of
the spring of the water of life gratuitously. He who is conquering shall be
enjoying this allotment, and I shall be a God to him, and he shall be a son to
Me." (Revelation 21:1-7)
All humans will then be immortals, like the angels.
"When the dead rise, they will neither marry nor be given in marriage. Instead, they will be like the angels in heaven." (Mark 12:25)
New Jerusalem will be the capital city of the vast and as yet unexplored Kingdom of God. The nations will thrive on the New Earth and will bring glory to the New Jerusalem. Every human who has ever been born will then be written in the Lamb's book of life.
"And I saw no temple in the city, for its temple is Yahweh Elohim, the Almighty and the Lamb. And the city has no need of sun or moon to shine on it, for the glory of God gives it light, and its lamp is the Lamb. By its light will the nations walk, and the kings of the earth will bring their glory into it, and its gates will never be shut by day—and there will be no night there. They will bring into it the glory and the honor of the nations. But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb’s book of life." (Revelation 21:22-27)
“And he shows me a river of water of life, resplendent as crystal, issuing out of the throne of God and the Lambkin. In the center of its square, and on either side of the river, is the tree of life, producing twelve fruits, rendering its fruit in accord with each month. And the leaves of the tree are for the cure of the nations.” (Revelation 22:1-2)
The river of life will flow out from under the throne of God and wind throughout the New Earth. Along its banks will grow the tree of life which was in the garden paradise that Adam and Eve alone had access to until their original sin. The tree will produce twelve fruits, a different fruit for each month. I envision animals once again living with and among immortal humanity on the New Earth. The water and the fruit will nourish them, and the leaves of the tree will cure any illnesses they may have.
Humanity will then be a unified body of immortal believers. They will have been redeemed from death and made into the image of God and Christ Jesus.
"Rejoice in the Lord always, again I will say rejoice!" (Philippians 4:4)