The Last game I played was Splatoon 3. It really depends on a few things, Am I an Inkling/Octoling? Do I speak the language? Where am I? In Splatoon lore all humans died in mass floods, so if I was still human I would probably be studied. Also, if I’m in the middle of the ocean I would be screwed either way. Assuming that I am in a major city or at least near civilization, and I am an Inkling/Octoling, and I speak the language, I would be fine. As for what I would do, I would sign up to work at Grizco, and once I have enough money buy a gun and participate in turf wars to gain money, eventually buying an appartment.
Do I get the ability to build things instantly like the protagonist of factorio? If I’m suddenly stuck on a planet with super hostile aliens and I have to build automatic weapons and flamethrowers from pure iron ore with my current skills, uhhh, yeah I’m in trouble.
The question is if you can make yourself some power armour before you choke to death in the smog filled hellscape you’ve built.