I would recommend the book “Writing into the Dark” by Dean Wesley Smith. He has great advice for discovery writers to be super prolific.

Also, are you doing Kindle Vella? I’m writing for them and finding that it’s helping me churn work out faster when I need to “discover” a chapter, rewrite and edit it so that it’s finished and ready for the world, and then move on to the next one. It’s actually super liberating doing it that way.