There is a piece of advice I give all any writer I work with; and typically what works in fiction also works in life.
Why are you writing this particular story?
What is the personal, internal, emotional reason for picking up the pen and choosing to express yourself in this way?
I am sure this is important for other art forms. There is both safety and power in intimately knowing the story that we are trying to tell.
You should be able to sum up your story in seven words or less; in actual fact your story can often be contained in a sound, like a groan, a cry, a laugh or a sigh.
When we know the emotional reason for our story, fighting for what we are trying to achieve is as easy as breathing.