I'd suggest you open a new file (or get a blank piece of paper) and start writing something along the lines of "I need to write this beeping sequel. But what can I write? Well, so far, blah blah blah..." Basically, a discussion with yourself of your work and any ideas you may come up with. Eventually, you'll probably work out what happens next in the story. And once you know that, there's a good chance you'll want to keep on writing.

-Zo"but I'm not much of a writer myself"e.