I don't really know the answer to this question and it seems like it would be subjective but I think that we can only know the will of God through the bible. Jeremiah 29:11 says:
"For I know the plans I have for you,” declares the Lord, “plans to prosper you and not to harm you, plans to give you hope and a future."
Ephesians 2:10 says:
"For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do."
We were made by God and he had already prepared for us in advanced to do his will. God sees the future and if he says that he will do it then he will do it. One of the questions some humans might ask themselves is Why are we here? We are here to do Gods will. God had already prepared us to already do these things and if it is apart of his plan then we should live by Gods will and not our own because it has already been planned out. Ezekiel 24:14 says:
"I the Lord have spoken. The time has come for me to act. I will not hold back; I will not have pity, nor will I relent. You will be judged according to your conduct and your actions, declares the Sovereign Lord."
Once God has spoken something it can't be undone unless he decides to change it but he says it right here that he will not hold back and he will do it and this is talking about the future and it is already planned out.
If God already has a plan then how does free will have a part in that plan? My main question is if God's Will is Predestined. This question is not to challenge Christian Doctrine but to simply go over things about Predestination.