Talking to people one at a time is the simplest thing that might work and anything that avoids that is pretend work. Other people's problems aren't abstract, they are real. They aren't in a book, you have to find them one at a time. Good luck.
Well said!
If there's no PM, I'm guessing everyone in your team talks to customers. How does the team align and prioritize multiple user pain points, requests, or insights?