Earlier quoted context omitted.
Can you get absorbed in a movie or binge watch a TV show? If so, I suspect your attention ability is still intact. You just need to re-practice consciously directing it again. I still struggle with it too, but was able to "get lost" in a book again. It was key though to move my phone way out of the room, and was hard to get started.
I can't stand most modern media, the only way it's tolerable is by watching at 2x speed.
I have awful attention spans, but I find that if I challenge myself by watching stuff out my comfort zone, I'm able to pay attention to it so well. If I know it's a great work of art, I find myself paying attention to just about every single shot, the composition of the frame, etc. It's incredibly rewarding, and it definitely makes watching most modern content impossible now
(That being said, I absolutely loved Pig and The Green Knight from this year)