First of all, congratulations

Honest question expecting your honest response. How much of it's written by AI? Recently, I noticed I am liking thoughts of real people over the super structured, emdash-y, zero grammar mistake AI texts.

I want to support authors who share their experiences, rather than guiding AI to write thoughts

I did not use AI to write this. I paid professional editors to help me get it polished. There were 4 rounds with 5 different people. I also got lots of grammar/typo comments using helpthisbook (hundreds of readers pointing out errors).

I did (very rarely) take single sentences to ChatGPT and ask it for the correct way to punctuate it.

I personally have always used em-dashes, perhaps incorrectly. I actually tried to learn the correct usage and stick to using it when appropriate. One of my goals in writing this book was to become a better writer, which I could only do (IMO) by writing and getting editors to help me.