It helped me a lot to play around with different styles, instruments, softwares or even arbitrary limitations. It'll be a step backwards at first, but forces you to discover new things.

Hey, I just solved a similar dilemma in Baldur's Gate 3. Have you tried waiting for a dashing rogue to show up and give you some encouragement?

People have good ideas in here! Also try playing with some new people if you can!

Try to make something deliberately bad. Like, aim for so-bad-it's-fun? Or comedic parody tracks?

Or maybe make little tracks whose purpose is firmly communication rather than quality. Such as soundboard-type effects to use as gif-equivalents when talking to friends - either to mess with them or to communicate "this is my mood right now" or what have you.

Or maybe take a break and do another kind of art for a bit, then come back.

I started an all-trans punk band online, and my usual music is singer-songriter. The new project really pushed me, and turns music making into a social activity! I also started another solo project that is 100% cello covers of contemporary songs (last one I did was "girls just wanna have fun"). Both of these projects push me out of my usual, and breathe some fresh air into my music. Maybe you could find some ideas that pushes you out of your comfort zone?

Practice copying other people's songs. Changes, vibes, subject matter. Mind you, this is only for practice. But it is the way plenty of musicians develop their musical grammar in order to use the language in their own way. See: jazz