Know what your characters’ wants are
Interesting stories come from characters who want something. Romeo and Juliet want each other. Harry Potter wants to beat Draco Malfoy and Slytherin in Quidditch. Hannah Baker wants the people who led her to commit suicide know how they hurt her. Writing a fiction book requires that you have compelling characters, and characters who have strong wants and desires are the most compelling kind there are.
Source: WritersDigest