Assuming that everything is gone including modern weapons(Cheap kids running around with guns, I'll staple them to the walls with my spears!)
I'll hide for a period of time in a secretive location.
After a year I would emerge fully strengthened and glorified from the caverns.
I'll recycle buildings and skyscrapers.
I'll construct a ward and learn the ways of farmers, smiths, carpentry, and mining.
I'll then venture to the forgotten isles of the amazons and try not to get killed. If I'm successful I'll have an ally c:
If I do survive then I'll trade for a boats they have, sail to Europe and seek for friends (after I find some in the US.)
And I'll look like this:
