Well, first of all, determinism precludes any notion of free will. Second, even if we allow random chance, free will is still an incoherent idea. Behavior is either caused by certain factors, in which case it is deterministic, or it is at least in part random, in which case it is just that - random. There’s just no conceptual mechanism - that I am aware of - that allows for free will to be anything more than an illusion.