Working an old book new

Take a novel-in-progress, ten years old.   Call it ninety drafts, though you believe it's many more.  Take every original character out, but two.   Change the plot.  Change the genre.  Change the cast (save for those original two).  Keep only the landscape, and a scene or two with food.  Change the tense and change the tone.  Weave and dodge and braid.  Uphold the bulls.  Encourage the horses.  Explore Seville.

If you are still working on this novel it's because it will not let you go.