First forget inspiration. Habit is more dependable. Habit will sustain you whether you're inspired or not. Habit will help you finish and polish your stories. Inspiration won't. Habit is persistence in practice.
You don't start out writing good stuff. You start out writing crap and thinking it's good stuff, and then gradually you get better at it. That's why I say one of the most valuable traits is persistence.
People who want to write either do it or they don't. At last I began to say that my most important talent - or habit - was persistence. Without it, I would have given up writing long before I finished my first novel. It's amazing what we can do if we simply refuse to give up.
The big talent is persistence.
If there's any single talent a writer needs, it's persistence. If you can keep at your writing and you can learn as you write, you can tell any story you want to tell.