Writing a novel required one to choose the subject matter according to one's own preferences and interests in order to make the work more interesting and fascinating. If you're interested in science fiction, you can consider writing one. If you are interested in fantasy novels, you can consider writing one. If you are interested in historical novels, you can consider writing one. No matter what the subject matter was, the most important thing was to write your own characteristics and style so that the readers could feel the charm of your work.