Definitely had this issue. I still struggle with it but have come up with splitting my life/mind into three and reading three books at “once”. #1 I have a serious book almost always non-fiction, something I need/want to learn. #2 I have a ‘spirit’ book, either religious text of some sort or self help style- which also includes workbooks, divination/meditation & journals. #3 And lastly I have a ‘fun’ book- whatever doesn’t fit into the first two categories and really perks my interest. I don’t have much I need to read/study for work & I’m out of school so I can be really flexible. I pick one based on mood and just go with it. Sometimes I make it a chapter, realize I wasn’t really paying attention and re-read it or I switch to another category. #3 is the easiest to read and most forgiving about being unfocused yet it works like a warm up to me for the more serious stuff sometimes. I’ve also found I need more of a ritual to read now. I put on background music (lyricless for me), keep a notepad near by for brainworm thoughts- or just reading notes and all around make 'time & space’s to read. Seems to be helping, definitely relaxing but man, I really miss reading every chance I got, anywhere & everywhere and somehow retaining it all.