I think out of all of the traits out there, self-confidence may be one of the most critical ones. Why? If you have insanely high self confidence in yourself, you will not have fear, you will not have self doubt, and I also think you’ll just be happier.
The first prescription that I have is get into really really really really really heavy weight lifting, the one rep max style. The Eric Kim hypelifting, powerlifting 2.0 style.