650 years ago, the place I live was inhabited mostly by the Ojibwe (a Native American people), so I suppose I'd try to find some of them and try to convince them to not kill me and let me stick around long enough to learn their language. Then I could teach them some of my knowledge. Maybe by the time the Europeans come along they'll be a bit more prepared.
If I can't find anyone, I don't like my chances of surviving for any significant amount of time. Maybe I could make it a few weeks foraging for food and fishing or something, but realistically I'll probably end up starving.
This is the kind of AI that will change the world, not the word salad machines that burn through massive amounts of compute to sound kind of intelligent. The ability to train an AI model to identify problems is incredibly useful, whether it's sewer blockages or cancer cells.