Let's look at the four powers: wisdom, energy, unblemished life, and benevolence.
The first power is wisdom.
What does the Buddha say about shyness? Well, what is shyness? Shyness is a manifestation of doubt and doubt is the fifth hindrance:
SN45.177:1.1: “Mendicants, there are these five hindrances.
SN45.177:1.2: What five?
SN45.177:1.3: The hindrances of ...
Sila, upright virtue, is the cause of being not shy, good householder, as one lacks of faults. Going upright into what ever assembling, fearless in regard of good and proper deeds, is the cause of firm fear of wrong-doing and concern.
Lose of shyness is one of the rewards of going after good virtues, Silas, goodness.
A fool might be shy, out of conceit, to ...