How to work through underearning?

I have this model:
C: working for others (as an employee or contractor)
T: they should be paying me 2-3 times more than what they are paying me.
F: undervalued
A: I look for ways to grow my own personal business so I don’t have to work for others
R: I grow my business in innovative ways

My question is feeling undervalued actually serving me? Or should I work to get rid of the feeling of being undervalued? It seems like a negative emotion to have and many times I think I shouldn’t have that feeling.

Also when I did a coaching session on this the coach asked if I had seen Brooke talk about underearning. Where would I find that? Or what is the general approach to underearning?