Closing the loop in user feedback means responding to users, keeping the conversation going, and addressing their concerns. To do this effectively, product managers should use a positive tone when responding to negative feedback, ask the right questions when responding to feature requests, re-examine top-of-funnel messaging, build relationships with users, record and analyze feedback, and follow up on issues. By doing so, they can create a fan, solve problems, and make users feel valued. This approach helps product managers continuously validate their product strategy and improve the app's performance and user experience.