I've been in a horrible reading slump for years. I was fine with audiobooks and podcasts but just couldn't concentrate on reading.
Finally I've found that Agatha Christie novels hold my attention - they are fast paced, not overly complicated, and got me interacting with the story as I played detective while taking notes on the clues in the story.
Now that my reading muscle memory is coming back, I'm able to branch out to more complex books.
I don't know if I'd call it a slump. I liked reading, but just don't read much.
But I recently picked up James S. A. Corey's first book in "The Expanse" universe, Leviathan Wakes, and I'm having troubling putting it down!