I think positive enforcement is good. Too bad depression often tells us we aren't allowed to pat ourselves on the backs for "small" things. Or I bet it would help the mood some to have a rewarding feeling. So a concrete thing with stars might actually help. And it would give a sense of overview as well.

Sometimes I wonder if it is two things that make people shower less when depressed. One is clearly motivation and energy. But another thing... that I can't explain. I heard people rather washing in more complicated ways than showering or bathing and they still find their method easier when they are depressed. Maybe there is a sense of vulnerability like innate... when you're both naked and down?... IDK.