There's a number of ways to model, all of them useful and fun. Including business models--I'll bet you didn't see that coming! But the most successful businesses are the by people that are creative and innovative and thrive in change.
There's a short, little quick read of a book titled The Dip: A Little Book That Teaches You When to Quit (and When to Stick) by Seth Godin. And yes, it's all about business. So, why read it?
Because it's also about engaging your passion, being the best that you can be--and also realizing when you need to "let it go" and when you need to "keep on going." Don't we all struggle with that? And I believe all creative people perhaps "let it go" a little too early OR "keep on going" a little too long. Since every project is so close to the heart and so much a passion...a business model creates a tiny bit of objectivity.
Hint: If you step away from your current beloved, take a break (a small one) often you can return with renewed energy and enthusiasm and a touch of objectivity--and those "insurmountable" problems can be solved!