God can guess better than anyone else, perhaps. But in order for you to have true free will, your decisions must remain unknown until you make them. If all your future actions are already written in stone, free will is only an illusion. At best, God can know all of your possible choices and the choice that you are most likely to make. But there always has to be a margin of error for free will to truly exist.
Every destiny comes with a destiny activator or proof producer. Someone God will use to bring out he best in you. Elisha needed an Elijah, Joshua needed a Moses, Lot needed an Abraham, and Timothy needed a Paul