My process was a multi-year process of recognizing my vulnerabilities. A couple of things that come to mind.

Meeting and liking people who were really different from me, with mindsets completely different. The kind of people I would previously judge as "dumb" were suddenly teaching things that improved my life. For example, my beliefs are science-oriented, and I am very skeptical, but now I have close friends who are esotericists, and I really enjoy passing time with them.

The book "The Courage To Be Disliked" by Ichiro Kishimi and Fumitake Koga. Help me a lot to understand myself and my insecurities.