Writing fast, and in a series, offers the best chance of success as a self-published author. It isn’t the only chance—there are other paths—but it is the most reliable. Because if you write fast, and in series, you can make a living without ever having a hit book. A hit book—or at least a moderately popular one—is a requirement for the other paths. And a hit book is far more dependent on luck, and hitting the right mark at the right time, than your skills as a writer. Readership trends are notoriously hard to predict. Even if you write a…