I only discovered fantasy novels as a grown-up. As an early teen I loved reading historical novels. The one that lured me over into reading more difficult and bigger books was Aidan Chambers’ Dance On My Grave. A YA novel before that was a thing.

Origineel bericht: https://bsky.app/profile/did:plc:l5fnjgd4iqrds6x5bwzamz6n/post/3mhuiawyg722j

But YA actually was a thing in my library, though they didn’t call it that. There was a rather strict age division in our local library. So on a blue card for the children’s library I could not take out adult books. But once you turned 13 you got a yellow card.
With the yellow card I could browse the adult section and take out the books labeled AD (for adolescent). That’s how I found Aidan Chambers and also Hadley Irwin.
(Anna Woltz’ books remind me a bit of Hadley Irwin. Maybe that’s why I keep recommending them.)