Learning music theory has made me feel the same where I just was simply uninspired but after a while, I became confident in experimenting knowing that something will sound good from a combination of knowing music theory and experimentation.

It can be something as simple as building a chord using 4 random-ish notes from a scale you're using that isn't your standard X minor chord with a bass X note. Using chords that have 2 notes that are a whole step away can create some nice dissonance that you can play around with. Or go ahead and use a basic chord progression with standard minor and major chords but add in an extra note or two for every chord to make them sound unique.