One of the biggest author challenges is finding the people who will love your story. The first step is to identify who they are. This is not always simple, but one place to start is their age. This is not always readily apparent, however, because many stories span a huge range, from elementary school to retirees, like the Harry Potter or Twilight series.
Nonetheless, it’s a start, at least for where you expect the majority to be found. After that, the next step is to figure out where they hang out. In today’s social media saturated world, this is likely to involve finding Facebook pages and hashtags that your target audience would relate to.
If you don’t have a clue, then maybe that group doesn’t comprise potential fans, because you should have something in common with them if you expect them to embrace your work. If that’s the case, then maybe you need to go back to the drawing board.