The strongest person may be the one least interested in proving strength.

Demonstrations of strength usually come from a doubt that needs settling. Someone who genuinely has capacity has less reason to display it, and often prefers not to, because the display costs something and settles nothing they were worried about. Quiet is frequently what security sounds like.

Pay attention to what you feel compelled to prove, and to whom. The compulsion is a useful map of where you still feel unsure. Working on the underlying doubt does more than any successful demonstration would.