Creativity is something you can actively work at, and the more closely you know your own process, the more reliably the muse appears. Having said that, I think we all know that some days just do not go the way we want, and sometimes that’s chalked-up to being uninspired, or bored, or lazy. Probably the latter two.
I really believe that the more you understand what inspires you, the more readily you can put yourself in her path.
Ask yourself how you feel, how you think, about this thing about which you are so uninspired. Find an opinion; find something in there that you ARE passionate about.