Weekend-project: sort your books!
As I am writing this, I am knee-deep into sorting and categorizing my book-collection (non-fiction, scientific) and it is about the longest time all week I spent without looking at my phone. Overall I am about 50 books in, which is a surprisingly small fraction of my books. Maybe 10 percent. In the spirit of extracting and organizing knowledge and link it all together, I have started to use page markers a while ago and the trick is to stick a couple of those on the first page of the book so they are always present if you find something cool, so you mark the page straight away.
I am doing this to enter it all in my r/ObsidianMD system. It is my goal to take books I have bought but never really read and read them until I get at least 5 interesting facts, quotes, links to other projects. Often I get stuck reading and taking notes without really noticing, but even with the boring books I get those 5 items easily.
However, you do not have to. Just physically sorting your books, listing and otherwise organizing it, realizing how much you have on certain topics, by certain authors, and so forth is a terrific way to get away from your phone and into the good old world of books again.