I did that once — the skipping out to work on something else — and ended up writing a more than 100k novel. Still didn't have a solution for the one I'd set aside.2. I don't have a definite conclusion in mind. It always gets off course when that happens. Outlining tends to resolve this.
Tempted to find something else and finish this later. Already written a short set in this same era in another place.
At the moment I am having an issue with the mid-section. Middles are my nemesis. I always know the end before I ever start writing. In fact it's conclusions that creep into my mind and tell me to write the story leading up to them. I've tried outlining, but then never stick to it.