There are 32 sci-fi books listed. Let's suppose you have read half of them, and you read 1 book each week. You've now just got your list for the next four months. Congratulations!

But wait, there's another list out there you're going to find tomorrow. And then another list, and another, and another, and they all have this same quality of having some books you've read and like, and nothing by Neal Stephenson. Then, when you're in the book store you see a book called "100 Sci-Fi Books To Read Before You Die", and you note it has these qualities but there are 80 books in there you've not read yet.

If you're busy pulling a sub-list together, you're doing the thing I'm suggesting: you're editing and curating, not just seeing the list in its own right. I'm definitely not suggesting you take wild guesses - note the magazines I read to find my own "next thing", and even that method is problematic.