Understand and solve the customers problems. Identify what to build and why.
A feature no one uses is not only useless, it also drains resources in its design, implementation and maintenence which could be better spent elsewhere.
You should track to which extent deployed features actually get used. Use this data to take the neccessary steps to improve usage where it makes sense, and retire features which seem like a lost cause in order to reallocate resources to areas of the product which are considered more useful.
Product management