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
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