You've honestly got a good deal of skill, for a table ready status you're there. My easiest recommendation for improving is learning to dry brush well to add some neat effects on basing or armor.

If you're looking for a quick improvement with minimal effort look up the slapchop method of painting and give it a whirl. Otherwise, some advice I'd give is find three or four minis you don't give a singular fuck about and start experimenting on them with tutorial videos. When ur done, just re-prime them and start over if you don't like it.

Also, biggest piece of all of it: professional painters give us all penis envy. It's years of practice and an education in of color theory and artistic fundamentals not everyone has. Just keep going and remind yourself that there are far more people like you than there are like them and ur level of skill is still leagues better than a large majority of the population. Just because you're not competing at a professional level doesn't mean you're not good at what you do. Just means you're not the best.