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Think of the ending, where you want your characters to finally end up. Then once you have that picture in your head. Start moving backwards. Don't be too specific in your thoughts. Don't go to fast, and don't go to slow. Once you've reached the point where you are in your writing retrace your steps with words.
If that doesn't work...
Try and explain the characters emotions. You said you are at a point of change, well how are the character's reacting to it? That can get you started.
If that doesn't work, tell me and I'll think of something else