Book Raid has just put up this page: Best Book Promotion Sites – 2023
They have a long list of book promotion services with short descriptions AND, this is the cool part, authors who use these services are being asked to write reviews.
I’ve written a couple reviews and I’m going to go back over there and write a few more. Then I’m going to read everybody else’s reviews. And if you self-publish, I bet you will want to do the same.