If the Big Bang is true, then it would reason all that would happen is linear, meaning everything in the universe that would ever happen was set in motion at the set off (time being an illusion or relative).
Choices are likely an illusion as our minds cannot comprehend the entirety of the universe and it’s place in it. Free will probably doesn’t exist; we are objects of fate.
I believe in re-incarnation, what I'm not clear on is how many times do you come back. But I believe each life you live are built for you to learn new lessons of life. The lessons learned in a previous life I believe are in your subconscious and help steer you toward decisions made in the current life. I do think your destiny is based on how well you learned previous lessons in life and how well you subconsciously re-apply them in your current life.