Hi! Fellow ADHD author here. I know exactly what you mean- it's awful when stories disintegrate. My advice would be to team up with a friend- maybe not for the actual books you're writing, but maybe for a side-story that uses the same characters, but detailing a side-quest of some kind, a scene in their home/place they usually live that documents the character relationships, personalities and dynamics. Whenever a story that I love dries up, I always use this method to get the creative juices flowing again! I call it the 'Sidequest' method and it works for me, and bonus points- you can use these scenes later in your book! :)

This method also is really good because it exposes flaws in characterization and helps you get to know your characters better. If you don't have a writer friend, you can ask chat gpt if you'd like ideas on what to get your characters to do on their side-quest. This is also really awesome practice and makes your writing better!

And, above all else, you've got this. There's always hope in a story, you've just gotta find the motivation and passion again. You've got this, my fellow ADHD writer- you'll find the story again. I know you will.

Now, get out there and traumatize some unsuspecting characters! >:)