i like this a lot! there's a lot of creativity on display here from what i've check out so far, and i'm looking forward to digging through it some more; this is real solid content
i think my only suggestion so far would be to maybe include 1 to 3 of these subclasses in a free version of the doc, so people can get a taste of what they're getting before they pay for it? there's a lot of 5e homebrew out there, and a lot of it's really bad; seeing the quality of this content would probably make people a lot more confident about taking a chance on buying it.
love your work, this is good stuff