I’ve had my digital drawing tablet and worked with Photoshop for three years now! I still have a long way to go to improve, but I like to think I’ve improved quite a bit already! Continuous practice is really the best thing that I can recommend. If you take a look at my really early art (Here and here), you can see a lot of struggles I’ve had in the past with adjusting to digital. A couple of years ago I had big issues with: using the program, handling digital colors, and drawing in straight lines (<–this one especially!).
Big things that have helped me are:
+Getting comfortable with the program (Knowing how to work with layers, opacity, and figuring out keyboard shortcuts; can be done through simple exploration of the program or Internet tutorials; getting familiar with shortcuts and the program layout especially help to speed up the art-making the process!)
+Utilizing natural, fluid pen strokes (Mostly done with practice–I still struggle with this! A good way to practice is with stress-free doodles in between projects.)
+Knowing basic color theory and learning how to apply it digitally (You can look up color theory basics online if you don’t know them already, along with articles about digital coloring! My coloring still needs a lot of work, but once I learned about color theory last year, I think my art improved a lot!)
I hope this helps! ^ ^ Don’t give up! It’s very frustrating to get used to it at first, but it’s a very continuous learning process and starting is the hardest part. Also, don’t be afraid to experiment! Especially with different styles, brush types/sizes, and color palettes! I wish you all the best with your drawing endeavors!