My approach to reading that I have been doing for decades is to read simultaneously. What I mean is that I tend to read at least six books at the same time. There are demanding and less demanding books in my stacks of six.
One advantage is that I never get stuck. I am always ready to read at least one of them.
I have also found that the conversation across books, even on very different subjects, brings another S: serendipities!
Here’s a typical current stack by my reading chair. Three of these (Dante’s Inferno, Stott’s Cross of Christ (first half), and Bunyan’s masterpiece are rereads.