I’d think any kind of endangered animal, to ensure I’m not killed for sport or something, but also big enough to not be anythings food. Elephant maybe or bear? From there, it’s easy, since I’d be able to kinda write as both of those, start writing messages. If I’m in the wild, go to a camp area or trail humans use a lot, leave messages everywhere until someone records me writing them. At that point, I’m sure some kind of government scientist would want to know why and how I know English. Then tell them I want to talk to the president as I’m actually an alien.
Do I turn back that moment? If so this is gonna be awkward, but I also just turned from an animal to a human… so maybe it would add to my alien story.