The UK's most famous self-help guru, Paul McKenna, argues in his book Change Your Life in 7 Days that the secret of charisma is just that: unshakable self-esteem.
I do wonder if an individual's level of extroversion has something to do with it too, but unshakeable self-esteem alone could well be what does it as that would affect a person's extrovertedness in parties full of strangers.
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