There’s much more to music, than the music itself. The sound we hear is just the container for the emotions and feelings it conveys. Music is like religion. It gives meaning, often to thoughts and emotions that are confusing, difficult to reconcile or too complex to convey into words alone.
Lacking internal inspiration, you will need to find somewhere public where you feel comfortable to be a fly on the wall. With eyes and ears open it should be quite easy to make a few observations, overhear a few words and uncover a gem that you can polish and turn into a song.
Routine is an important part of maintaining your productivity. But sometimes that routine becomes the very problem that is stopping you from getting fresh insight.