Famous pivot stories are often failures but you don't need to fail before you pivot. All a pivot is is a change is strategy without a change in vision. Whenever entrepreneurs see a new way to achieve their vision - a way to be more successful - they have to remain nimble enough to take it.
Writing a novel is one of those modern rites of passage I think that lead us from an innocent world of contentment drunkenness and good humor to a state of chronic edginess and the perpetual scanning of bank statements.