You might not have great ideas until you start writing
You might have a great idea but forget to write it down.
A problem with unwritten ideas is that the flaws are less apparent. There might be a gap in your thinking. Writing it down might help you see the error.
Writing some of your bad ideas might clear out some space in your mind for good ideas. Instead of waiting for good ideas to write, maybe just write all of your bad ideas down until you get to something good.
You might not even be able to tell which of your ideas are the good ones and which aren’t. It’s easy to classify everything as either things that you don’t know or things that are obvious. If everything you know seems obvious to you, how will you know what isn’t obvious to other people?
You might come back to something and realize later on that it was a great idea. Perhaps a connection that you make in your mind later adds that extra thing to make a good idea great. Often this is what happens when you think back on advice that you have received in the past. Several years ago the artist Peronel Barnes advised me to use writing for my art business. This was great advice, but it took me years to realise that it was great advice.
“I write because I don’t know what I think until I read what I say.”