I started a book about 2 years ago, got about halfway through, and then got sidetracked. I know this is a typically bad habit of novelists... Fortunately, the book idea that distracted me made it to the finish line.
Now, I want to return to the first book, but the energy of the book I carried around in my head has disappeared. I have to get to know the characters all over again. I do want to write this story, and I've had a lot of cool ideas over the last 18 months I want to incorporate. Also, I think I'm a better writer now than two years ago.
So my question is, should I start over at page 1 and rewrite the story using my first draft perhaps as a guide but basically rewrite everything, or should I open my chapter files and edit them as needed knowing there will be some massive makeovers?