You're blocked, so you do what you're told: more discipline, word counts, butt in chair.
It made things worse for William too — a year stuck on a novel, until he quit, and two days later the ideas flooded in.
The block wasn't weakness; it was his unconscious refusing a project he'd outgrown, and you can't force the unconscious, only stop yanking the reins.
So is a block a wall, or a signal to follow?
A signal — the elephant refusing a direction you outgrew.
Stop forcing it: loosen your grip on the project and the self-image behind it, load the problem and let the night shift work it while you sleep, and freewrite daily to open a vent without judging what comes out.
The version of you trying to come through has something worth saying; your only job is to get out of its way.