First, find out what your hero wants. Then just follow him
From ‘The Art of War for Writers’ by James Scott Bell
If you are a “character-driven” writer, spend an extra 10 percent of your writing time ratcheting up the action. How can the events of the story be made more threatening, suspenseful, fresh? If you are more on the “plot-driven” side, spend 10 percent of your writing time going deeper into the emotions of the character, how she is reacting to the events, how they threaten her inner well-being.
“A scrupulous writer, in every sentence that he writes, will ask himself at least four questions, thus: 1. What am I trying to say? 2. What words will express it? 3. What image or idiom will make it clearer? 4. Is this image fresh enough to have an effect?”
– George Orwell