Challenge yourself. Try picking 10 sounds out of your library and see if you can make a song out of them. If I'm feeling uninspired I'll pick 10 sounds usually in this order
5 Drums (1 snare, 1 kick, 1 open hat, 1 perc, 1closed hat)
1 Pad or string
2 synth plucks or shortened sounds
1 vocal sample
1 random item
Challenge yourself to make something out of these. You can even challenge yourself to search for a type of track by keyword and then try to flip whatever track comes up in the search.
If this fails, try watching some videos on sound design/production. You might have outgrown your skillset and are in need of new tools in your arsenal. It can get boring and repetitive to use the same strategies, even if the end result sounds good. By building your production skills not only are you going to be better at making music, you'll open up more ideas and ways to achieve older ideas through simpler means. I hope this helps you along the way.