Gather feedback from your users with direct contact. The feedback will help you in improving your application and focus on the right aspects for future developments. You can use customer interviews, calling your customer, visit customer support, eat your own dogfood and act as a user as options to gather your feedback.
Examples are CES, NPS, Ask the customer, Customer support records, Questionnaires, Eat your own dogfood, Be the user.
Picture or project