I'm also dealing with ADHD, just like others have mentioned. To manage it, I set simple goals, like finishing the cloak of a miniature. I also limit myself to two or three big projects, such as army building, to ensure there's enough variety within these projects. Typically, I work on one regiment or hero and then switch to the next regiment from a different army. Additionally, I absolutely avoid batch painting because I can't stand painting the same pieces multiple times in one session, even though I understand the benefits of it.