Creative ruts can be difficult to overcome, as they have a tendency to feed on themselves. Getting out of your comfort zone is a good idea, as are the recommendations from Sirius. Self assignments are a good way to break out of a slump. I can give you an example of one which worked for me. It may not be for you, but it may trigger an idea which is. About 20 years ago I was in a creative rut. Not doing much photo work for a few months, spending a lot of time listening to music. Some song titles conjured up potential companion images. Rust Never Sleeps sent me to a junkyard, photographing close ups of rusting vehicles. Purple Haze sent me to a garden shop, doing blurry photos of purple flowers. Lost In The Supermarket had me photograph a little kid staring at a huge display of cereal boxes. You get the idea... I never finished the list of songs I made, but it served its purpose. The creative juices were reignited.