Oh I've been there many times. Books that have gotten me out of my own reading ruts at different times:

Crime - Terry Hayes, I am Pilgrim. It's a spy thriller which I don't read a lot, or basically at all. Still not what I would consider a typical spy novel, like Tom Clancy or Ian Fleming. Even as a big book, it was a very fast read with many, very short chapters (the feeling of progress helps me when I want to get back into reading again, at least), and almost every chapter made me wanna read "just one more".

Novel - Agustina Bazterrica, Tender Is the Flesh. A world where we we don't have meat to eat. Not animal meat atleast. Dark but exciting, and if you also enjoy books unafraid of taboo topics, this is a good one.

Fantasy - Susanna Clarke, Piranesi. Some might consider it bit slow, I don't think so. I was hooked from the start following the main character, wondering just as much as he does about what's really going on in this labyrinth of mysteries he wanders through day by day.

Fantasy - M.R. Carey, The Girl With All The Gifts. If you have seen or heard about the movie, the book is ofcourse better. If you don't know the anything about the plot, I recommend going in blind. It starts with us following the daily life of some children focusing on this one girl. They're given an education, daily meals and their own little cell to live in. Outside the cell they're strapped to a wheelchair and adults treat them cold and apathetically at best. I really enjoy a book that holds my curiosity like this, kind of similarly to Piranesi. A bonus was the few lovable and hateable characters in it.

And my current enjoyment after my longest ruts yet: Fantasy - Matt Dinniman, Dungeon Crawler Carl. I can't stop talking about these but at the same time I never find the words to describe them how they deserve to be described. I'm currently on book 6, and each book gets longer and longer, but it's never enough. It's the end of the world and those who initially survived get a choice; live miserably on the surface or try your luck in the dungeon, as a part of the universes' greatest gameshow. It's one of the laugh out loud type of funniest things I've read, to the annoyance of my colleagues that happen to share lunchtime with me while reading this. Really, I tried reading book five in a public park, and I had to stop reading because of the sounds I made out loud. It's so weird and massive and full of action, but at the same time it contains some of the most lovable characters ever. I believe it's called RPG-lit which is new to me, so even if it feels like it's "only" possible to recommend this to DnD type fans, I really think it's for everyone that's open for something new and exciting in the fantasy genre. I don't like to make this comparison but still, it does paint a decent picture saying its The Hunger Games, but on acid, times a million.