1.) Start a new novel.
With this tip, I also offer you a caution. I have successfully and unsuccessfully written multiple novels at once. It's a great distraction to get whatever novel you're editing off of your mind, but it can also be dangerous. Especially when your characters start moving between books. If you can handle juggling two story lines, two groups of characters, and two entirely different manuscripts, then have at it, because I can pretty much guarantee you that it's a great distraction! (I'm risking it and am currently working on a crime fiction novel while waiting on my dystopian novel.)
2.) Enter some writing contests. Make some money.
As writers, we're used to writing a lot, and not necessarily getting paid for everything we write. It's kind of a fact attached to writing, even if we don't like it (I know, I'd like to get paid for that killer essay I wrote in middle school, too, but yuh know...). However, something great to do while waiting between novels is to enter some contests and make some money. It's always nice to get a check for something you love, so why not have a go at it? There are tons of contests out there for short stories or essays, and I suggest checking out Writer's Digest and Writers Weekly, because they offer some great regular contests.
I don't think I need to add anything else to this tip. Maybe order a pizza or something. For real.
4.) Work on your hobby!
I'm sure I can speak for a lot of writers, when I say that when we're working on a novel, our other hobbies might fall aside a bit. I love to draw portraits (Check 'em out on my Instagram!), and when I'm letting a novel rest, I spend a lot more time drawing, and I LOVE it. Pick up that long-lost hobby and get back at it.
That's it for now! Now go write your novel. Or do one of the above if you're waiting on your novel.
Until next time...you know the drill! @Elysia_Regina