Here's a random tip I heard about music inspiration: if you're in a rut do something completely differently from how you normally do it. Do something the opposite way from how you usually do it or start using a different approach from usual. Maybe give yourself an arbitrary restriction like "no thirds, use more sixths instead" or pick something you normally do and do the reverse. If you normally start writing songs with chord progressions try starting with a melody instead. Or start with a rhythm instead. Just do something different so you're forced to have a fresh take on composition. Hopefully that'll help you see things in a fresh light.