I know this sounds silly, but reading genuinely never captivates me. I am able to imagine things with my minds eye, but it requires that I just completely focus on picturing something and ignore the book while I do it. I think I just have a bad imagination or just a stupidly short attention span for anything that isn’t a creative endeavor.
When I read informational content (research papers, history, geography, etc) I can straight up read for hours because I end up learning something cool.
My wife can read books for hours, but I struggle to stay engaged. Fiction/fantasy especially is rough even if the topic is inherently interesting to me. Poetry and short stories are okay.
Maybe look for some fiction that looks to engage your intellect. There is a very wide range of fiction out there. A few types that to mind at the moment would be, a of ideas like The Magic Mountian by Thomas Mann, a novel that blends fact and fiction like Belladonna by Dasa Drndić and W.G. Sebald’s works, The Malazan Book of the Fallen is fantasy that is both philosophical and layered with thousands of years of history.
Once you find the types of books you like it’ll be easy to find more. Getting started is the hard part. Also there is nothing wrong with just reading history! History makes up half of my reading, the only drawback to reading both history and literature is the endless want-to-read lists are even more endless than would otherwise be the case.