You get what you keep track of. Keeping track of something raises consciousness of it and enhances self-accountability for goals. I recommend keeping a simple list of the books you have read and when you read them. Another possibility is to keep a page number tracker with page volume goals.
You can start a dedicated section on your bookshelf to collect the books you have found most important to your evolving discoveries and understandings. I have shelves for what I have read and shelves for what is in line to be read next.
More and more of these materials are available in audio format. To save on eyestrain, I try to have one paper book and one audiobook in progress at any given time. It is best if the two are quite different in character; one non-fiction and one fiction, or at least on two contrasting subjects. Try listening to a book while on an exercise machine, and the time on the machine can fly by faster, which can be a healthy result for mind a body.