A lot of screenwriters have a drawer of unsold scripts that they cut their teeth on. I don't have one. Everything I've written, after my first spec, I wrote on assignment. Everything I've written was work.
Jon SpaihtsI studied physics at Princeton when I was a college student, and my initial intention was to major in it but to also be a writer. What I discovered, because it was a very high-powered physics program with its own fusion reactor, was that to keep up with my fellow students in that program I would need to dedicate myself to math and physics all the time and let writing go. And I couldn't let writing go, so I let physics go and became a science fan and a storyteller.
Jon SpaihtsYou don't control whether your movies get made. You can't. All you can control is whether your draft is great. So, you write your great draft, as best as you can, and then move on to the next thing.
Jon Spaihts