I’m in a perennial state of writer’s block- I only write when I have a clear idea of how a scene would play out. Most of these imaginings come from dreams or conversations I overhear in public. If anything, I never try to fight against my block. But then again, I don’t have a deadline.
My suggestions? Have a piece of paper or your phone handy to jot down ideas whenever inspiration hits. Expose yourself to the public. You’d be surprised how much you can learn about people from hearing their conversations on the subway.