Know Your Genre
This goes hand in hand with knowing your audience. There are key elements that fans of certain genres will expect to find when they start reading your work. More often than not, genres can be divided further into subgenres that accommodate very specific motivations and plotlines. Keep it consistent. It is possible to write a successful cross-genre story, but you don’t want to mix it up too much. A supernatural romantic thriller, for example, could end up alienating fans of all three genres.