I may be strange on this, but I have never felt like I need automatic recommendations, and any I have gotten feel more like a nuisance.
I have my list of books on BookWyrm and sometimes I look at it and go like “oh I wonder what this author has been up to” and I look it up, or I participate on some online discussion about what people have read and if something sounds interesting I add it to my BookWyrm list.
I’ve also added a couple of books from people I follow there, who have interest in common but sometimes add this entirely unexpected book and I get to explore it.