I read mostly SF, but I try to read one NF book, 1 mystery, and one children’s book/month. Someone recommended The Remarkable Journey of Coyote Sunrise by Dan Gemeinhart and I loved it. I found his Goodreads profile and started reading the books he highly recommended and pretty soon I was reading really great kids books. So you never know what will lead you down a rabbit hole of great books.
I love learning new words. A good writer will make it clear from context approximately what the word means. That’s how I increase my vocabulary.
I was delighted when Ann leckie wrote her Ancillary series. Many years before I had used that word in a report at work and my boss asked me what it meant. I was surprised he didn’t know because I thought it was a common word, having run across it in my reading.