One key element is having a strong central idea or theme. This gives the novel a sense of purpose. Another is the use of effective dialogue. It makes the characters seem more real and helps move the story forward. Additionally, a good understanding of the genre's conventions in gaya menulis novel is necessary. For instance, if it's a mystery novel, there should be elements of suspense and clues.
Read a lot of novels. By reading different styles and genres, you can learn from other authors' techniques. For example, you can see how they develop characters or build suspense.