At 9, I didn’t need to go to a library—we just had bunch of books at home. Books are cheap, especially second hand. Some of our books were in fact from a library (my mom went, but I never did), so those would rotate.
I suppose the fact that books were physical and I did not have something like TikTok on my phone when I was 9 helped me read whatever was lying around.
As adult I used Kindle for a while but got back to sourcing physical books, even though I have no permanent place and books are difficult to travel with.