We can change our minds about what we believe. Yet sometimes our culture promotes one to stick to old beliefs without questioning them. “uncertainty is the very thing that art thrives on.” It is our natural state of being to not know, and it is through exploration do we make decisions. Often we avoid these as we have a held belief that others will find us as weak, or we have a belief that changing our minds is a form of defeat. As one moves forward through uncertainty, clarity of direction presents itself only through navigating through bad ideas. Giving one’s self time to think, to allow incubation for an idea to flourish into possibility, may be assisted by interacting in a community of like-minded individuals. Other methods Kleon suggests are reviewing the past ideas especially an opposite one everyone’s forgotten, or reading old books to find new ideas.
I encourage you to buy a copy of Keep Going for a better understanding of your own creative process. Whether you're a master artist or beginning artist, this is an excellent book.