What's Your Line in Tenet?

The big question in Tenet is free will. Free will and providence in a world that seems determined. And so if everything is determined, how do we engage? We have this, is this just a illusion of free will? Or do we actually have a way of living that is a secondary cause in the world or a causality in the world at all? Really causing the question causality. You kind of get these paradoxical loops in his films about what caused what?