Alright, this might be a bit presumptuous. There's no all-size-fits-all success cheat sheet for Kickstarting an indie game, especially these days, of course there isn't (sorry!)
But there are some things you can do to give yourself your best chance.
Would you ever develop your game without a plan? No GDD, no direction for the story, atmosphere or gameplay? The likely result wouldn't be so pretty, and you know it. And marketing is no different: it's not like whip-up magical stuff. And for that very reason, you actually can promote your game yourself if you're smart about it.