I actually wrote a book that addresses this: Snap: Seizing Your Aha! Moments, because I have found a way to get inspired on a regular basis. I have a lot of ideas, but the trick is to organize them and light them on fire, so I can write passionately about them. I use my formula to mix and match ideas util I find one that feels creative to me. And since I write nonfiction crime, it's easy to find ideas out there.