I'm just putting this out there because I'm thinking about it and because I want people to know it's not just them.
I don't really read fic anymore. It's not because I stopped liking it, though. It's because I made a rule for myself that I'm not able to follow.
I told myself that if I read a fic, I should comment on it. And not just "I loved it!" but a detailed comment. A live reaction or at least quoting favourite lines. Maybe talk about symbolism or about references I caught or about characterization etc.
I did that because I loved the authors I was reading and because I'd received so many lovely comments like that and I wanted to be able to pass that joy onto others. But then I found it hard to actually comment like that.
I could manage it sometimes? Oneshots weren't too hard, for example, but multichaps? My rule was that I had to comment every chapter. And the kinds of comments I wanted to write, well that meant reading on my laptop because I hate typing on my phone.
Eventually, I felt so guilty when I read fic without commenting on it that I stopped reading fic altogether. Better to just not read if I wasn't able to hold up my end of the bargain.
I shifted out of my fandom not long after that, and I haven't found a new one that's sparked the same interest (ie obsession), so I don't know if I might be able to fix this habit if I ever get into a new fandom in the future. All I know is, don't be like me.
Comment as you can and when you can, but don't set up strict rules like I did. I can't speak for all authors of course, but I know that personally, I'd rather you enjoy my work without commenting at all rather than make yourself feel so guilty you stop reading it altogether.