Your users are your best testers.
Real people find what your tests never will. Make feedback easy to give, then sort it before you act on it.
Ask
In The App
A small feedback button on every page.
Watch
Five Minutes
Watch someone use it without helping.
Check in
After A Week
Three questions: love, hate, missing.
Measure
Usage
What's used, what's ignored (Day 75).
Sort before acting
Bug: it's broken. Fix it.
Confusion: it works but people get lost. Redesign.
Request: something new. Weigh it against the goal.
Watch, don't just ask.