Although this sounds like a chicken or the egg situation, you are actually the one who resides – sort of.
If you can create a clear idea of the type of person you want to reach, you can begin to build a profile. Start with, “The kind of person that I want to reach has the following problems they want to solve or needs as yet unmet.” Then imagine/guess. Write for that profile person or persons and you will attract those with the problems or needs you will address.
Things that your audience might want can include
- How to do something
- Finding new books of type X, Y, or Z.
- connecting with like-minded people
- discovering new authors
- How to change something
The possible list is endless. But it mostly just starts with you saying “my new readers will be people interested in _____” and then writing for that class of person.