All that matters is that when they talk, they are heard.
Alphas make themselves bigger and give themselves presence – it comes from body language, vocals, how they carry themselves.
If they look away or get distracted, be the first to walk away, get even more distracted or become immediately busy. ELIMINATE the fear of being the one to break a group's state by taking the lead and beginning or ending something first so that others will follow.
Don't be uncomfortable when speaking to others or groups.
They know that they will eventually succeed if they keep trying.
Alpha males do not give up just because they failed once Alpha males don’t like to lose. But not in the sense that you just get lucky if you’re born fat or tall.