In my experience, it's hard to suggest your book to book clubs. Most of them like to keep the way they choose books within the group itself at their discretion, even if you offer a discount, donate paperbacks, or even gift it to them. I've been on KBoards since around 2014-2015 and have yet to see any authors mention they found a reliable way to get their books into the hands of book clubs, unfortunately. I've joined a handful of Amazon online book clubs and submitted my book to their pool of choices and that's about the closest I've gotten. I think two book clubs have read one of my books before and it was completely random happenstance. I was notified via Instagram that a book club is going to read my sci-fi first in series this fall, though, so that's nice, but I don't think I did anything particular that made me more visible to them; they just happened to choose my book.