Don't focus on improving.
I'm serious, don't laugh! I work on my comic several pages at a time, and before I started my current job I was pumping out work as fast as possible just in case I wouldn't have time later - and I kept thinking, there's a sort of expectation to improve at drawing between however many pages.
Turns out, that was the thing that most kept me from actually improving. I was so focused on the amount I was drawing, mechanically, day in day out, trying to complete 4-6 pages every fortnight - I wasn't actually focusing on drawing. I ended up not improving as much as I wanted, taking shortcuts, cutting corners - just generally speeding along too fast because I wanted to say "I've done X many pages so I must be better by now, right?"
I took a step back. Started actually focusing on the process of sketching, composing, lettering, colouring etc etc - it made me think a lot more about why I drew the way I do, where the gaps in my knowledge are. And that's when the improvement started to come along more naturally I think. Even basic things like consistency in character design, shading, layouts.... But I couldn't start improving until I stopped trying so hard to improve.
That was long-winded and personal and I apologise (it's late and I've had a loooong day). But I hope it helps, somehow!