It is certainly possible that you have lost the ability to focus, but why not try this much more straightforward explanation first: you didn't like the last cou

It is certainly possible that you have lost the ability to focus, but why not try this much more straightforward explanation first: you didn't like the last couple of books you've read, which is why had trouble finishing them. It is absolutely not uncommon to go from "ugh, I'm not in the mood for this book" to "hmm, this story just doesn't seem to be going anywhere" to "well I could've written something twice as good as this" before hitting on a book that aligns with what you're interested in reading at that very moment. Try to read something different. Follow recommendations from other people. Don't read something because you feel you have to.