An established book publicist has connections with media people, book reviewers and industry folks. If they get your book in front of two or three reviewers in major media, the readers of the reviews could number in the millions. You have a quirky story with a great hook...save the world by doing stuff in your backyard. With all the concern about any number of environmental and social issues, exposure of the book and it's story should generate huge sales. At the price point you are selling it on Amazon for, you only need to boost sales by 1800 copies to break even. By the way, I question the category that you have your book listed under. Conservation doesn't begin to describe it. "Gaia's Garden: A Guide to Home-Scale Permaculture," which would seem to be something close to your book topic, is listed as #1 in "organic." You can select at least two categories to list your book under. Picking the correct categories will get your book in front of the right people.