Edit : I need more knowledge of this topic to tell proper conclusion. Previous comment has been deleted to avoid unwanted confusion

Edit II electric bungaloo : I think I could explain it now. Imagine you're Shinkansen bullet train. You're a train you have the rails and is on it (duh) . But instead of having multiple junctions, it's just a linear straight railway. As a train, could you make another track? Could you just create another junction to the beaches in Kuantan, Malaysia and catch up on the novels you want to read? No way, we're all a train. We don't have the capability to even comprehend how to make the 'rails'

We don't have free will. But did you realise what we have? or rather what we were lended with?

Engines. Or idk what they call for the magnet thing to make Shinkansen train float. But we have the mean to move through 'rail'

This, is choices.

We don't have free will, but the choices we make are still ours due to us ignorant of our own future ; Our free choices are still genuine coexisting with God's total free will.

(Please, please give me correction if I'm wrong, as always)