I remember reading that the author Ray Bradbury made it a practice to write something everyday and I think he did. I'm not there but I've been trying to draw more these days. More than I have in the past couple of decades. Draw anything. Some of the drawing are hasty sketches of ideas for actual paintings and sculptures that suddenly come to me. Others are more detailed exercises in color, texture and detail. Some of them end up being finished drawings. And some of them no one needs to see them.
What do you do when you don't feel like drawing? Draw anyway. What if it's the middle of the night and you are trying to go to sleep and suddenly an idea pops into your head? Draw anyway. What happens when you think an idea you want to draw may be a silly and not worth drawing? Draw anyway. Or what if you think a drawing might not turn out as you expect it will? Draw anyway.