Books for 8 year olds are starting to get more interesting than when they were younger. Multiple chapter books mean that your child can read longer books without feeling so overwhelmed. They can just read a chapter at a time. Or they can fall in love with fascinating characters over several books in series.
Or you could explore a different side of books for 8 year olds. Activity books can contain interesting stories as well as encouraging your child to solve puzzles, colour in illustrations, or carefully place stickers. This helps improve several skills at once, while your 8 year old has lots of fun.