go find people who are better than you by a lot. one way to quickly do this is to join some sort of physical exercise class e.g. running, climbing etc. there will be lots of people who are better than you. you will feel smaller.
or you could read research papers. or watch a movie with real life actors who are really good at acting.
you will then figure out, as @Algon has mentioned in the comments, that the narcissism is load-bearing, and have to deal with that. which is a lot more scary
I recently heard that thinking out loud is an important way for people to build trust (not just for LLMs) and this has helped me become more vocal. It has unfortunately not helped me become more correct, but I’m betting the tradeoff will be net positive in the long run.