Well, you have precedent for just deciding "wait, I came up with a better version of how that could be written, I call 'never happened' on that story and here's a new story". But hey, if Song of War never got to a point where you were happy enough with it to release it, then it's better off beng unreleased.

After the kind of year you've had, I thank the whims of Eris that you're still alive and hanging out online. That you are actualy still thinking about your awesome fanfics and working on some of them? Bonus.