The only thing I've published on Medium on the subject so far is at: https://katharinevalentino.medium.com/so-you-want-to-write-your-memoirs-76fdf15e29a5. I realize you've written about "finishing" your memoir rather than starting it, and I hope you settled on a theme to guide what you include and what you exclude before you started writing.

I can recommend a particular book but unfortunately lent it to someone and haven't got it back yet. When I get it back--soon now that I have a need for it again--I'll give you the title (correctly instead of guessing at it) and the author. Stayed tuned, as they say.