When I was a teenager I was really into martial arts and my teacher gave me an important advice:
When you have to fight a group: Search for the strongest one (leader) and beat him. Because when all the other group members see that you have beaten their leader, you wont have to fight them as well. You will receive the respect and they will fear you.
I think you can also work like this on approaching groups: Search yourself the alpha male (the leader) and befriend him. As many others will come by to seek alpha males validation, you really benefit if they think you are a buddy of him. You will get in his "league" and the other betas in the room will see you with a higher value.
Cheers
sky
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