This question disturbed me very much some time ago. At that time, I realized there are a lot of information for beginners, but if you have already reached a certain level, you need todig deep to find something. Therefore, I went to the Internet to look for advice there. And I found a few things that helped me and I want to share them here
Learn the most basic basics (if you haven't already). Theory of composition, color, knowledge of anatomy and proportions are essential in practice. For example, I just decided to retrace everything to identify my "blind spots". Just don't get hung up on impeccability of your work. The internal structure and basic knowledge are much more important. Drawing is an ongoing experiment and is constantly changing and evolving. A good artist should be able to use all kinds of materials, different working methods, different surfaces.
Think about why you draw and why you do what you do. You need to think deeply and understand WHY you need all this. So, you will have mor confidence for your actions.
And the most important (for me): try new things and seek inspiration. By that I mean a lot, a LOT of new things. It can be ANYTHING. New supplies, mediums, new unusual and even weird techniques, surfaces, completely new styles, etc. I read trying a completely different kind of art (pottery or graphite as examples) can help much. In the process of searching for new ideas, I suddenly began to color simple coloring pages (https://artistro.com/pages/free-coloring-pages-for-adults) and a new world opened up for me. It turned out to be very similar to meditation, I relax in the process and my brain started generating ideas. Study art. There are already so many different techniques, ideas and works around us: old and new, strange and understandable, for all tasts and ages. Study what is happening now in contemporary art, because contemporary art can bring ton of new ideas. Watch this video, for example: https://youtu.be/UPWPdqI0-sE it blew up my brain.
Good luck, I hope somethigs here can help!