The Stranger's End of the Century

Have you ever thought about what role you would play in another world? In a multi-dimensional overlapping world where magic and technology intertwine... There are not only orcs, elves, dwarves, vampires, dragons, but also various deep sea civilizations, dinosaurs that have existed for a long time, weird alien creatures across dimensions, etc. If you come to such a world as a stranger one day, what achievements can you make or how long can you survive without a system?