I go and find inspiration, sumthing as far away from music as possible, but i find its a case of dont look for it, just wait. or I try and learn something new, weird and experimental sounds are a great source of inspiration.
I think the biggest source for writers block, is lack of experimentation (ie just repeating everything in tracks), once you learn a new technique or way of fuking with the sound, inspiration often flows natrually, so it might be that you have exhausted your current knowledge, and your brain isnt getting the tingle of excitment it got from those sounds before....experiment, dont sell out on your brain by repeating stuff you've already done several times before, once you pick up some new ideas, you'll be able to combine them into sumthing new and interesting to get your dopamine levels spiking again
well thats my pop psychology view of it all anyways