I find that giving myself some way to work on an "assignment" - typically self-assigned - helps me with "inspiration".
For example, I had no idea what I wanted to do for the current "shadows" assignment. This morning I got up and it was very clear out (winter here, usually very overcast). I thought "low sun, long shadows" and put on my layers and grabbed my camera and headed out. Not even sure where. I ended up at a playground, got some shots that I really, really like ... and then when I finally drove away, I was seeing shadows that I wanted to shoot EVERYWHERE. I simply didn't have time to stop to shoot them all!
I sometimes try to pick something I'm not so good at (for example, close up shots, more abstract subjects) and go out shooting with the goal of working on that area.....