I've started a personal art challenge that I'm going to share with all of you because why the hell not:

It's called 20 x 25(pronounced Twenty By Twenty Five), and the premise is that you pick a specific thing you wanna get better at drawing, and then draw 20 of it a day for 25 days.

To keep it interesting for yourself, I recommend writing up a list of 25 themes, one for each day. Get creative and add variety within each day, too- maybe combine the current theme with a future one! Here's my day 1 page: