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.
Everyman’s library and Penguin Clothbound are popular options.