Once you are done and the editing is in you need to do something to attract your readers, the more the better. How else did JK Rowling become the wealthiest woman in England next to the Queen?
My idea is this; The Milward Chronicles is five volumes covering nearly 3000 pages and close to a million words. It all takes place on a world of my own devising, and there is a map. For every reader of my series who recommends it to someone else and they can send me proof such as a copy of a review, an email a text or whatever, I will mail them a printed and originally autographed copy of said map.
There you go.