If the Lord knows your future and that future includes that you cease exaltation immediately upon death, what can you possibly do to change that knowledge in God?
The answer, of course, is nothing. The only difference between the Lord predestining and simply knowing a future is that it makes the Lord nothing but a spectator to human suffering.
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So, why do you believe God sent us to this life?
***So, why do you believe God sent us to this life?***
I can’t say that I know why you are here. I am here to glorify God and enjoy him.
BTW, I did notice your underlying presumption of pre-existense. It is denied, but I chose to ignore it in answering your question.