Then you should broaden your imagination.
Amazon and Goodreads have barely a fraction of one percent of the books that were published. And that's just in English.
It's like saying "Anything worth watching is on streaming," even though less than 5% of the world's video content ever made the translation from film to VHS to DVD to streaming. Or paper to records to tape to CD to streaming.
There's a whole vast world of content out there beyond the internet. Once you discover this, it's like taking a pill in The Matrix.
(My metaphor might be off there, as I've never seen The Matrix, but from what I understand from other people's conversations, that should work.)