if you have sustantial traffic going into your website/ product you can do a log analysis of usage patterns on your application. The log analysis can give you ideas on the following:
- why users visit your website
- which features/ buttons that your website users click most often
- where users drop off, this will show you where the gap in solving the problem is
If the traffic statistics are not sustantial to give you an idea of the above, you can talk to other people who had the same problem as you that led you to create the web application. The important points to take note when talking to people with the same problem would be:
- what are the main causes that led to the same problem you and other users faced
- how other users mitigate the issues currently without the use of the application
Hope these points help!