They're probably doing the same thing humans on our earth were doing for centuries until ~1600. Surviving. Given how cruel nature is I think we're lucky to have the resources to do more than just survive, to build up all this crazy technology we don't strictly need to live, just for fun/profit.
Most people get on with life without inventing much new stuff themselves. It was interesting trekking in Nepal that you could go to places without electricity or cars and life went on really quite similar to before and probably still does. Though they may have got solar electric and phones now - not quite sure of the latest status.
