Enthusiasm. You need it. It’s the thing that will keep you working when everyone else says you should stop.
Sorry, I’ve been watching a lot of John Oliver segments, lately. The thing is, to be in love with your work is a lot of fun, and can encourage you through some dark times. Just getting yourself to sit down and make the things can be hard, and it’s the enthusiasm you have for it that can get you started. And once you’re started, you can keep going. It might take a long time to get to where you love it, but you should at least feel an affection for the stuff you make, otherwise it’s just the Pit of Despair from which you shouldn’t even think about trying to escape.
You don’t have to be your own biggest fan. But you ought to be a fan.