One thing that I find to be very valuable is to perform self assessments after significant milestones. I consider what I did well and what I could improve upon

One thing that I find to be very valuable is to perform self assessments after significant milestones. I consider what I did well and what I could improve upon. Then I consider how to improve. Always exposing myself to new ideas and trying them on toy projects amplifies this technique, because it gives me a source of ideas for the "how."