To the OP: the table looks really nice, but the article could have more "meat". Maybe you were afraid of retreading the material, but one short paragraph on each of the AARRR metrics and how the SaaS metrics affect them would make this more useful as a reference for the average bootstrapper.

Also think how you can turn this into a series instead of a collection of articles. One obvious choice, since you are writing about churn, is to go over each of those "circles". See one good example of creating a series to build a mailing list here: http://www.trevormckendrick.com/