How do you get over the fear of charging more than a few bucks for your app?

Since i built every part of my app myself, i know every tiny flaw in it which makes asking for real money super uncomfortable.

I keep setting cheap $3/mo plans or huge free tiers just because i'm worried people will complain it's not worth it.

For solo devs who started out underpricing everything how did you finally build up the confidence to raise your rates?