The idea of turning down full ride to Berkeley (#1 in many majors, big top rate school) and Caltech (which is honestly the most beautiful campus, filled with stellar peers, small intimate, etc) for some perceived MIT upside (and magical admission chances after a gap year), we can’t believe it.
I personally have no advice, but you really don’t understand what you have been given in life and have rejected. We are mostly ordinary humans whose kids either don’t get in or can’t afford it or both.