A classic book on using writing to come up with new ideas is "Thinking on Paper"[0]:
"Thinking on Paper shows how writer's block as well as many other writing problems are engendered by the tendency, supported by traditional approaches, to separate thinking from writing. Drawing on the developing field of symbol theory, V.A. Howard and J.H. Barton explain why this separation is unsound and demonstrate how to improve dramatically our ability to generate and express ideas."
"Thinking on Paper shows how writer's block as well as many other writing problems are engendered by the tendency, supported by traditional approaches, to separate thinking from writing. Drawing on the developing field of symbol theory, V.A. Howard and J.H. Barton explain why this separation is unsound and demonstrate how to improve dramatically our ability to generate and express ideas."
[0] https://www.amazon.com/Thinking-Paper-V-Howard/dp/0688077587