What feeds your muse and keeps it strong? Some know the answer to that quesiton, others couldn't tell you. For the longest time I belonged to the latter catagory, I really didn't know. Ideas seemed to fall out of the sky and that isn't a good thing. You can't exactly make them fall when you want them to. Then one day I woke up and recalled the most vivid, amazing dream. It stuck with me so much that I wrote it down. I bought a journal and put it beside my bed. Everytime I woke up and could recall them, I wrote down my dreams.
A few book ideas have developed out of my dreams and even more ideas for chapters and characters. Recalling isn't always easy. I've realized it helps if I fall asleep focusing on remembering my dreams in the morning. Alarm clocks don't help, neither does sleep deprivation. It doesn't always work but when it does the effort is usually well worth it.
Think of your muse as a muscle in your brain. Like any muscle in the body, if you don't work it and feed it, it will whither away. The more you work it, the easier using it will be. A strong muse equals a strong writer. Try a dream journal. You might be surprised at the ideas that come out of it.