Did you try shopping your work to agents, or to the few big companies who still accept unagented submissions? (corviddesign.com)
Amazon is actually accepting unagented submissions for the Kindle Serials program, but does specific in the submission guidelines that the authors are expected to engage with their readers throughout the process of the book; additionally, there is an exclusivity agreement between Amazon and the authors who opt to publish their books in this format. (goodereader.com)
News came this week that Bloomsbury UK was the most recent publisher to realize that authors are tiring of the hoop - jumping, as the announcement that its new YA and New Adult imprint Bloomsbury Spark would accept submissions from unagented authors. (goodereader.com)