For me, on every project, I realize that I've boxed myself into a corner, or that the play necessitates some sort of theatrical convention that I realize I hate while I'm making it. So then the next play is always a rebellion. Or like, the thing I didn't even realize I was doing last time I will make sure I don't do this time. But there's always some other blind spot. And then that blind spot inspires the play that comes after.
Write a short story every week. It's not possible to write 52 bad short stories in a row.