Clustering Is Fishing.
Look on clustering as fishing in your subconscious mind. You never know when you’ll hook a big one. Even if you dislike a project, you’ll become inspired. Follow the energy of your inspirations; let it take you where it wants to go.
If you have no idea where something’s headed, that’s GOOD. Let it gestate for 24 hours, then do another cluster, and you’ll see where it fits into your project. Stephen King talks about his “boys in the basement”; his subconscious mind. Let the boys do your work for you. They’re a part of you, and they’re much better at writing than your surface mind. (They don’t care about the inner editor.)