Feeling very optimistic.
Have been stuck on a screenplay that I wrote the first draft of a few years ago and am doing a page one re-write on. Last night as I was falling asleep, I had a huge breakthrough - that what's needed is to take the idea back to the original.
I'd made some changes to the main character as I developed it, and in retrospect, those changes weakened her, resulting in a stronger secondary character and too little external conflict.
If I take the character back to what my original concept of her was, while keeping those elements of conflict that have been added as I've gone along, then I think it will work.