To help give your self some ideas when you don't know what to draw (or paint)
Give yourself projects to do— there’s a list called "101 Projects for Artist and Illustrators” that Dani Jones compiled some years back and it’s a great place to start. Check it out! Or, you can always focus on the basics— do some life-drawings, study composition, challenge yourself with color studies. There are plenty of books and blogs that focus on these subjects.