Write. Write all you can about something that thrills and excites you. Write until you despise it, until you question your motives, until your hand doesn't function the way it used to and you catch yourself wanting to keep phrases that witty people said in a special place for you to recall later. Write until you're certain it's finished, or at least finished enough, then put it down and walk away. Write something else if you like. Go on an adventure. Get lost in a book you've always loved or an entirely new one. Then, when some time has passed and you've forgotten the finer points of your story, come back and read what you had written. Edit. Re-write. Accidentally maim your plot. Find a way to fix it. Keep plugging at it until you're proud of what it is, what it says, what you've accomplished. And then set it aside, and do it all over again.