The point of change has to be something significant for the character. Frodo's point of change in The Lord of the Rings is that moment he is going to be the Ringbearer (starting back in Middle Earth with Bilbo's legacy to him rather than at the Council of Elrond, though his life takes another massive turn at that Council). In Cinderella, the point of change is when the stepmother and her daughters come into Cinderella's life and all she knew before goes.
So what is your point of change for your character? Is it powerful enough to be the story? How does your character handle this? What help do they get or are they alone? Do they resist the change or fight back against it? (Cinderella should have sought help years previously, I've always thought the fairy godmother turned up far too late in that tale!). What are the ramifications of the change on other characters because Character A's life will change and that is bound to affect them too?