If it’s not a famous book, you may find some Goodreads reviews and if you’re lucky a Reddit post or two, but not vasts amount of online discussion like you’ll find about any passingly good series or movie.
And if you love a movie or a tv show, it is much easier to convince people in real life to also watch it, since it’s way less time consuming and not everyone even reads books, but most people watch movies.
I just think that this really sucks about reading books.
When I was a teen, I would read a lot of books in a month! But now as I am older, I find it hard to find time for it. It’s all work now. But I do read a little every day or mostly on weekends. I suggest you stop reading for a few days. Maybe you’ll get passionate about it again!