To be clear, I personally do not believe in predestination. I find it to be a patchwork theology based on a rather silly notion.
But if God has truly "picked" those who He will save and will not save then the following may be of some hope:
2nd Chronicles 30: 17-20
Isaiah 38:1-8
Genesis 18:16-33
Maybe God will change His mind if the non-chosen will beseech Him in sincere prayer?
Maybe?
God has left no one out to choose God in Son for them or not, that is done by Son, so we can be given the new life in God's Spirit and Truth, not of flesh and blood any longer, for us to view new from God Father's view. Romans 12:2
maybe: is a form of doubt. As even a modicum of doubt, keeps one from entering and seeing clearly.
Just read Isaiah 7:1-9 God through Isaiah tells the people a truth and says if you do not believe me, then I won't establish you. Today is the day to turn to God as every day is in belief trust, and not doubt God, no matter how the outcome might appear in fear.
F-alse
E-vidence
A-ppearing
R-eal