Comparison is the thief of joy, and I have two different ways I try to improve my art.
One way, set a timer. I do these five minute sketches at work sometimes, and I try to draw a character as detailed as possible within the time limit. Setting time limits helps you figure out what works well and what doesn’t as far as posing and facial expression.
Another thing I use, multiple medias. While I primarily post my digital art here, I also paint, use oil pastels, and markers too. All of those require different skills, but learning lots of different skills helps bring a creative mindset to anything you make.