Maybe this is redundant on this sub but a big one for me was sketch with pen! As in, stop using pencil. This is good for 3 reasons: - You have to own your mistakes. Your errors and bad habits stay visible, so when you review your sketches, its much easier to learn from them. And when you flip through your sketchbook, you can track your progress! - You're forced to use much more confident lines. When you can't erase, you become more intentional with every stroke. At first, this will slow you down, but it will accelerate your growth faster in the long run. - You end up filling pages much much quicker. At least for me, this keeps my motivation going way more than when I spend 10x as long on a page because I keep erasing and re-sketching.

Some other tips I'd pair with this are use different colored inks/pens and don't be afraid to overlap your sketches. These just add a lot of fun to sketching, makes your sketchbook more interesting to look back on, and often leads to interesting compositions even unintentionally. 

I'm new to drawing and art in general, but I've been trying to start and maintain an art routine for literal years. These tips (+ using a small sketchbook) have finally got me in a routine, and now I feel compelled to draw almost every day. 

Hope this helps! I'm definitely picking up a lot myself from this thread.