A couple years back when I was in community college I did daily doodles for 70 days. As small as that sounds it was a huge accomplishment for me and I had a lot of fun doing them! They were also some of my favorite illustrations I’ve done and often helped to spark my creativity.
I decided in order to make sure I keep drawing regularly I’m going to do daily doodles again for a while! Some will just be a little 1 minute doodle on the corner of my paper while others I’ll put more time into. It’s more just about making myself pick up a pencil at least once a day. They also generally won’t have any particular theme, I just start drawing and see what happens. Enjoy!