This is generally my position. I think arguments in favor of determinism make more sense than the ones I've seen so far for free will. But I don't consider it case closed.
But what's your argument for free will?
When you decide to do something what leads to your actions that is not compelled by your desires, goals, values and then external factors and the situation?
We have moment A and then moment B.
When you choose at moment B something leads to you choosing that was not there in the precise instant before that. Your state and the state of things around you. What is that?
And wouldn't you want to do what your desires and knowledge would lead you to do?