I thought you meant non apocalyptic world.
Since there would be no need for any money obviously if you were the only human.
I draw for a blend of the two, I draw for social reaction. Not in the sense of gaining some type of fame or money, I draw because I love the world around me and what I mean by social reaction is that I want my art to be a doorway for other people to enjoy it as much as I do. I saw alot of video game landscapes and characters when I was young and how beautiful it all was, how happy, adventurous,curious,fascinated it made me feel and I liked it. If there were no more people in the world, I probably wouldn't be drawing because I'd me much too fascinated by the newly abandoned real world.Salvaging things and building elaborate shelters In the middle of streets out of bicycle parts or something, or houses out of sea shells. I wouldn't have anyone to show how amazing an alligator sketch is because I'd already know how amazing an alligator is. Then again I probably would be doing it because that lovely artist OCD would be ever so present, thus my brain possibly would have to prove to itself over and over again just how amazing it really is. So I don't know about the process of drawing, I still have to work/think on that but I know for sure no matter what I'd be doing some kind of art.
One can quit drawing, but can't banish creativity, I could quit drawing but i'd inevitably become that old lady that puts beads, flowers,and hearts on everything..