When your imagination is feeling tired...roll the cubes! Rory's Story Cubes are a fun way to challenge your songwriting. They are dice with an image on each side instead of a number. There is also an app for your phone! I have multiple sets of the cubes and am very willing to roll for you if you don't want to invest. I tend to roll four "regular" and one "action". Then write the lyric based on your roll. The results can be interesting! In the past some have created songs that were quite amazing. Tag it #storycube and post it here so we can find it.
An example of one from my history is this. I rolled - an arrow, bridge, hand, web, and the action cube was a person pushing.