Wait, does the question mean that I literally go exactly 1000 years back? Because if so then I would like to go to the nearest ruler, show them my amazing knowledge of the future, and hope that they won't kill me for witchcraft HOWEVER, if the question instead meant that I could go up to 1000 years back, then I would probably go to when bitcoin first started becoming a thing, investing lots of meny into it, and become a billionaire