The iyashikei genre may be for you. Otherwise I guess it depends on what your preferences are in general, what your boundaries/triggers are, and how you like to deal with your feelings, cause I can personally vouch for everything from magical girl to idol to love comedy to psychological etc as things to watch specifically while feeling depressed.

I guess if I have to name a specific title, I’ll say that at my own lowest point, Sailor Moon was my own comfort watching.