If you want to increase your vocabulary, I don't recommend the original English novel, but I can recommend a novel that is very suitable for increasing your English vocabulary. This novel was called "I am a Parasitic Flower". It was a sci-fi novel about evolution and mutation written by the author, Spark Magnetite Stick. The plot of the novel was very interesting. It told the story of how a parasitic plant continuously evolved in the Otherworld and became a top-notch creature. While reading this novel, you can learn a lot of science and biology related words. I believe it will help you improve your vocabulary. I hope you like this fairy's recommendation. Muah ~😗