The Last Human

You witnessed the destruction of your home planet. The one and only Earth, shattered into nothingness by a stray celestial body. Now you are the only human left. What do you do now? Do you explore the universe looking for a new home? Do you attempt to find a way to restart humanity from the ground up? Do you discover alien life as the only species to have every developed intergalactic travel and try to make new friends, or perhaps find love? Or do you simply fade away? Spending your remaining life in a melancholic tour of the universe with your A.I companion being the only one able to keep you company?