Template rejected for quality & usefulness

My app was rejected on the basis of “quality and usefulness”. I’m not sure what these mean. It seems to be in the eye of the reviewer who may not be familiar with the purpose of the app. My app, UX Notes (https://uxnotes.glideapp.io/) is designed for User Interface / Experience Designers to be as a single repository for all the questions, ideas, observations, information and suggestions collected during the process of designing an application for a set of users. It contains a variety of ways to classify, sort and filter these notes to help the designer see patterns.

I have over 15 years in the field of UI/UX design which included receiving an award of excellence from an international professional organization for a program I designed and built.