Word to describe realization of one's power or potency

Solution 1:

There is self-discovery which is about realizing one's true character (and not limited to one's power or potency alone).

ODO:

self-discovery
NOUN

The process of acquiring insight into one's own character.

‘The result is a sublime and surreal saga of self-discovery and personal growth, of existential doubt and doubtful existences.’

Solution 2:

Potential. Someone’s potential is an ability the person has not yet developed. "You too can achieve your ultimate potential."

Another form is potentiality, which alludes somewhat to the idea that it manifests as a fundamental force of nature.

Actualization or Self-Actualization, a term from existential psychology, the coming into one's own fulfillment.