how do you validate new features request from customers Before You Build Them?

Sprig it's a good option, if you have a ProductHunt comunity maybe with a lauch

Come up with the hypothesis first, and think about the minimum testable artifact. Once you have this, you need to go around and ask. 1. Survey 2. One on one session 3. Group discussion 4. Serivces like usertesting.com could be helpful.