Do you know who your actual users are? What do they think of your product, and why do they use it? Through usability research, you can learn to tell the user’s story and better design a product that fits their specific needs.
Through careful observation of users, you can construct stories and sample scenarios of use that can inform the design process. Don’t just make up your users’ story. Figure out what the user needs, what kind of experience your solution creates, and determine whether the solution actually works.