i had explored everything within the country, i might consider trying to get to other countries. the challenge would be, it would probably involve travel by airplane or boat. these are skills that would need to be learned and even once learned would still involve some level or risk.
while i think being the only person on earth would be fun at first, i have a feeling it would get boring or lonely sooner than expected. this might lead to a desperate attempt to find if there were any other people out there.
if years of searching did not find anyone, i would probably just continue trying to find new things to 