I think it's hard to be a good GM if you don't read a lot of everything.
I read everything, from trash to literature. I've literally read "Twilight" to understand that kind of storytelling to prep for a game.
Favorite novel? At this point in life, it might be Cormac McCarthy's "Blood Meridian". Violent, expansive in scope, deceptively complex characters. If they say a book can't be made into a movie, then it might be pretty good. "Blood Meridian" is one that has mostly defied Hollywood's interest in making it into a film.
What do I have on Kindle... A lot of trash, mostly. I do have some good books, like Kazuo Ishiguro's "Never Let Me Go". I also have Sapkowski's "Witcher" stories and novels. The Lord of the Rings often finds my way into my kindle. CJ Cherryh's Foreigner books are also stuff that I enjoy, although that series tends to go nowhere.
I'm also into less woke flavors of lesbian romance novels these days. (Imagine that scene in The Remains of the Day, where the butler is hiding the fact that he reads common romance novels.) Am I ignorant of world events or other ways of living? I try not to be. I might be a conservative, but I'm not ignorant... Not is every liberal wise simply because they are woke White leftists.
(Woke lesbian stuff tends to go on about Trump, about how amazing all trannies are, how religion is not compatible with gay lifestyles, how small towns are crap, and so on. Less woke novels tend to be about characters and character-centric struggle.)
I read for pleasure and to see lives outside of my own. I think it enables me to be a better storyteller, but that's secondary to reading for enjoyment.