I have two criteria now for what I write next:
- It has to be something people want to read.
- It has to be something I want to write.
The second criteria is more about theme. Usually I just jump into a story because I think the plot or the world is cool; only when I get to the end do I realize the story's supposed to mean something too. I've been a Professional Aspiring Writer* long enough to know that I'll enjoy most any speculative premise, but I can't be passionate about every theme.
So now I'm thinking not just what are the themes of my story ideas, but what themes am I interested in writing? Like I had this idea of a kid born perfect in a Gattaca-style world where people are obsessed with genetic perfection, but he resents the pressure and attention people put on him. I like the idea a lot, and the theme of trying to be yourself is common enough I think I could write it. But the idea of writing a popular kid, when popularity is something I've never really "struggled" with, makes me wonder if it's really my story to tell. Especially when I've got other characters in my head whose struggles I have shared.
That doesn't mean I won't write it (I really like the idea), but it's one of the negative points I'm going to weigh when I decide what to write next. Although maybe I should finish these current projects first...
What about you? How do you decide what to write next?
* Feel free to borrow that term.