The next time you're in a group, ask yourself "Are these people making me better or worse?"
At work, it can relate to your skills and talents. With friends, it can be about your attitude or mindset. At a volunteer event or when socializing, you can base it around impact or even connections made.
You don't have time to be around people who are making you worse at something.
One of the best ways to get better is to be around people who want you to be the best.
Self-improvement is a team sport.