If you're here to give or get mental health support, that is the primary purpose of our little online community.

Since I see you've been here a year and a half with us and have over 1,000+ posts, I'd say you're here for the right reasons. Since you're an established member here, I think it would be fine to post your book chapters in order to gain some feedback. (Can't guarantee any results from doing so, tho...)

However, I might also suggest that you find an amateur writing community online, where you'd be in the company of fellow writers, for additional feedback, if you're open to it.

Best,
DocJohn