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.
Check out The Blacktongue Thief if you enjoy fantasy. It's narrated by the author and he is very talented. I enjoyed the book itself very much but I think the audio performance is half the fun, since he knows exactly how every line is intended to be conveyed.