All writing is excellent writing. I write everything that inspires me in a separate Google doc titled writing quotes. There I write anything that sparks inspiration and I can use it in any of my writing.
You can also dictate your thoughts if writing is not possible. Which in my opinion is quicker since you tend to think faster than you can type. Unless you’re a stenographer which is amazing.
Every good athlete, musician, singer, builder, etc practices their craft to perfect their craft. Don’t let your ideas wonder in your mind put them on paper or on your screen. This is a great way to exercise your mind and to get you motivated.