I would try Young Adult novels (sometimes seen written as YA) because they usually have easier English and sentence structures but fun topics.
Ex. The Hunger Games series (dystopian)
A Court of Thorns and Roses (romance)
Anne of Green Gables (Coming of Age)
Ender’s Game (science fiction)
Holes (Coming of Age???)
Howl‘s Moving Castle (the book by Diana Wynne, not the movie)
Nancy Drew (mystery)
There are many more if you just search for Young Adult books!!