Predeterminism and free will are sort of different... The former is, everything is predictable, if you had enough data... I.e. if you knew the exact atomic position and momentum of everything. That, I think, is wrong, basically because of QM. (But it makes for an amazing sci-fi series "Devs" with Nick Offerman.) but "free will" is this sort of quasi-mystical idea that there's something directing your choices other than natural / biochemical / physical processes. This, I think, is also wrong. Consciousness, the idea that you are a distinct "thing" apart from the world, is an illusion. Take psychedelics to realize that fact.