How delusional does a solo founder really have to be?

Serious question.

I'm at that stage where I'm doing category education (which, iykyk, is a hard slog). Some days I think "this is obvious, why doesn't everyone see it?" Other days I wonder if I'm completely off base.

The thing about category creation is you're not selling something people know they need. You're teaching them to see a problem differently.

So, maybe the right amount of delusion is enough to keep building when no one's listening yet. But not so much that you ignore useful feedback?

What do you think? How delusional do we need to be?