Often I talk to authors about selling themselves to readers as much as their books. It’s natural for readers to want to know more about authors, their motivation for writing a particular book, even about the writing process.
Nowadays, with short books and short stories being produced in ebook and even print formats, there’s an added ability to market your books. No matter what you’re writing, you can create adjunct books.
Consider a self-help author with a workbook…the workbook isn’t the primary self-help book but it adds to the original publication in a helpful manner. Novelists, too, can use this idea by writing short stories about appealing secondary characters in their stories.
These can be sold, of course, or given away to generate interest in the book. Since most adjunct books are short, the time and effort to produce them is often much less than what the original project required.