The first version of my app totally sucked; everyone uninstalled it. My greatest learning was to ask for proper customer feedback. Not just a poll, but trying to talk with people face to face (or if that's impossible, in a call).

People will tell you what they would like to improve. I'd recommend a book like "The Mom Test", which is more for idea validation than UX research, but I still found most things very practical.

Source: https://speedbumpapp.com/en/blog/v1/