Perhaps this is not applicable to creative thoughts: I usually have "project ideas" that come up randomly. I have recently decided to stop investing any time on them. I simply observe the ideas and let them pass. What I notice is that some of said ideas, keep popping up. I continue the observe and pass process. Usually this process leads me to naturally filter ideas with the little cycles I spend in making a note/observation and letting the idea pass. I am trying to not actively invest too much time into ideas as I have a observed a personal tendency to "make things fit" and introduce biases.