Well, if that nightmare scenario came true, I’d tell him or her to realize that nothing in life has any real objective meaning and no one really has your best interests at heart and that you should pursue only what you find interesting or exciting and not waste a second of your life doing what society claims is good for you or attempting to live based on what other people want or think. What he or she would do is based on his or her interests so I can’t predict anything specific.
Would you help identify and encourage their interests?