Not sure it’ll work for you, but I managed to keep going with some habits (after they stop being motivating themselves) by being excited about what I could do after, “as soon as I’m done with my shower I can lie in bed and watch a YouTube while I get dry” or “after I finish my lunch I can have some cake”. It seems to trick me into dopamine anticipation, and it’s easier to switch around what the motivating fun activity is than try to find ways of making chores exciting in themselves.