The best advice that I or anyone else can give you is this: don't try to rewrite what has already happened. Write your own original story (it can easily borrow elements from other tales, but create your own). Find your story, set it in the Star Trek universe, and then write it.
Star Trek does not have to completely revolve around a ship called Enterprise and her captains and crew. You have an infinite universe out there in which place your tale within: use it.
Don't chain yourself to the past, write your own addition to the canon universe.