I explore different kinds of frontend. Each type of frontend provides unique challenges and constraints. Consider making a frontend for:
You can also try different kinds of website frontends
You can also try changing subject matter. Frontend design for a website is going to depend on the subject matter.
You can also change the interface technologies.
Best of all, you could combine a change in all of the above areas. Make a mobile app for a geocaching video game that is about food, etc.