Consider: The life you are living is nonfiction, but the life you would like to have is a plot. An alternate life could have endless possibilities, from your appearance to your family dynamics to your country of origin. What could you imagine your life being had your parents, or you, made a different decision along the way? When you are absolutely/positively stuck in a rut or facing a blank page, thinking about something drastically dissimilar will reactivate your imagination. An alternate life could send you down a bumpy road filled with alternate detours, which could lead you into a well-flowing story or manuscript.
Consider: One of your family members begins acting totally out of character. One day he/she wakes up totally different but acts as though they have always been that way. How long would you expect her/his character phase to last? Would this change be a good thing or a bad thing? Would you stay wary of or grow comfortable with their new attitude?
Consider: You are having an intricate dream in which you are still you inside but look different. You might even be the opposite gender. Then you realize you cannot wake up or you are not really dreaming and are forced to resign yourself to this alernate life. Everything goes along fine, disasters are averted, rescues are made, and then you wake up. What do you feel? Abject, furious, disappointed, or happy to be back?
Considering other alternatives will always lead you somewhere…