TRP has been a good resource for tips of becomin gf a better man, and this one is one that I find key to projecting a more dominant presence, and over all a more masculine image.

Breathing into your nuts.

Try this now. Stand up. Take a deep breath, like you're trying to fill your nuts with air. Now, in that same breath, notice how much deeper your voice is, how much taller you stand, how your chest naturally goes up.

I've found this is relly helpful to improve your posture, but also helps you project your voice much more powerfully, naturally, which allows for a more dominant presence. I'm more of a soft spoke guy, so this helps me project into a conversation much more influentially.