Ok, so I realize there are pros and cons to what I am doing, and I don't need the standard answer of "Do whatever you feel is best." What I'm looking for is experiences other people have had in similar situations and if it turned out good, if they regretted it, etc. What happened is about a year ago and poured hours and hours into writing a full length novel (roughly 72k words). I spent months submitting it to publishing companies and got no real interest. After working on some other projects, I am now back to writing again. I really have no particular interest in reviving this story, but instead I want to write a new one. What I really want is to create a new story with the characters and world that I used before. Altogether I think this sounds great because it will give me a new story yet allow me to use the characters that I'm deeply fond of already and have great histories. The downside with it is that if I rip these characters out and place them into a new story, the first story I wrote will become useless. I would never again be able to try and publish it without rewriting nearly the entire thing. It just feels scary, knowing that if I continue, this book that I poured months into will never be publishable... but will I really ever go back and finish it anyway?