Stop asking why the entire thing is impossible and find the first movable part.

Asking why something cannot be done produces a list of reasons, and the list is usually persuasive and completely unhelpful. Asking what can be moved right now produces an action, and one action generally changes the situation enough that the next becomes visible. The whole thing rarely becomes possible in advance. It becomes possible by degrees.

With whatever is stuck, look for the smallest element that would respond to you today. Do that one thing without worrying whether it solves anything. The point is to change the situation slightly so you can see it from somewhere new.