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Start by not calling yourself that, truly dominant men do not need such labels to be on top of things, they speak with action.
The rest is self-confidence and being able to take charge of a situation, be strong, but know your limits.
But also be respectful, that is where many mess up and end up becoming a joke, showing respect means you will get respect, no one respects some one who pushes others around in a crude attempt at showing off.
To endeavour to acquire these four main virtues:
Strength, Courage, Mastery... And most importantly, Honour.
To always seek to improve yourself in all ways possible, to not fear confrontation, to be honest and truthful... To fight...
So few millennials will ever understand this...