It's amazing we don't have a good answer for this yet.
For me it happened on its own and I realized I was fine with who I was flaws and all. Yeah I get disappointed in myself or whatever but it was just getting comfortable in my own skin over the years that seemed to mostly fix stuff like this.
Also a lot of observing the anxiety and then after it subsided realizing I don't have enough time to worry about everyone else like I was assuming people worry about me.
Sorry for the rambling it's late. Anyway wish you best of luck out there :)