The problem with "confidencemaxxing" is that confidence isn't a conscious decision. It's a subconscious conclusion. It's a lagging indicator.
You build confidence by keeping promises to yourself, developing competence, winning in the domains you compete in, and surviving failure.
People who try to act "confident" without the underlying evidence usually come across as even more insecure than they might otherwise be.
Learn to confidencemaxxx and watch reality bend your way. Winners act like winners. This is your sign to start believing in yourself. This is your sign to start becoming delusionally confident in yourself and the fact that it will all work out.