One of the things that I think marks a professional writer is the ability to be merciless to himself and to his writing when necessary. I'm not saying professionalism requires selling out, debasing your artistic integrity, or treating your talents with disrespect. I am saying that there are times you look at a project, even one you're 25K words into, that part of you loves very much, and realize that you can invest three years into making that one project work out, or you can nuke it and take on something else.
It's okay to be a pure artist, and to say, "No, I cherish this project," and I will work with it as long as it takes to make it right."
I think writers on the more professional end of the spectrum have to be willing to make those calls.
So that's what I'm doing for right now. Book #2 is being nuked. Actually, I'm parking it for another day. There's a lot of potential in it, and there are things I love about it, but while Book #1 is on query right now, I need to focus my energy n having an effective follow-up offering in a timely way. That's not going to happen with Book #2.
So now onto a new Book #2, which will be a stretching experience that will require plenty of its own merciless attention.