The first idea, and the one that would require the greatest time commitment, is to do 10 ideas (about anything) every day. The point in doing it is to flex the creative muscle. It didn't sound so hard when I first tried it; but just about every time, I finish six, then get stuck and labor over the last four. (It's supposed to get easier the more you keep at it.)
#2 and #3 would be to set aside 10 minutes a day to write or to draw, both of which improve with practice. Only 10 minutes sounds more do-able.
It starts April 3rd, but you could start whenever you like, and the website for more info is https://thegreatdiscontent.com/100days. They have ideas for things to do, too.