My to-read pile is taller than I am. I gave up choosing from it in order years ago. Instead I ask three questions.
1. How much attention do I have?
A busy week is not the time for a seven-hundred-page novel. Match the book to the week, not to your ambitions.
2. What did I just finish?
After something heavy, I want something light, and the other way round. Contrast keeps reading fresh.
3. What am I curious about right now?
A trip, a conversation, a news story. Reading what you are already wondering about is the easiest reading there is.
The pile can wait. It always does.