I’m old so I’m trying to piece this together. I believe main character vibe means someone has to have to behave like their problems are THE problems of “the story”. And by doing that, they are more successful at competing? Competing at what? Like getting more money?

Idk man, there a million ways to skin a cat. You have to feed yourself and whoever you are responsible for, so you do need to compete in “the marketplace” or whatever. I guess if you’re an influencer, it probably helps to portray “main character” energy. It feeds the illusion that your opinions should matter and therefore your product recommendations matter. But I think for most average people, hustling and birth luck are what help them succeed.