Normally you need to talk to him on the next day (he is in his shop in the Megabuilding normally)
I walked around everywhere, searching every corner and piece of land and water, and can't find him after achieving 'very strong' status at home base. Keeps staying stuck on day two, and I end up dying of no food.
I think to pass to the next day, you need to go back to your shelter to sleep (like one of the first map of the game)
