Doomsday again

Assuming that you, an ordinary person, are approaching the end of the world, how would you live without a golden finger?Xiao Yiqi, an ordinary college student, whose peaceful life was interrupted by the sudden apocalypse, locked himself in a small building with nothing left to witness his own death and body decay, but his soul stopped here for some reason and could not leave , and finally he discovered the mystery, and by chance, he went back to the year before the end.what will he doThe end of the world is like a primitive place where the weak are preyed on by the strong and only the strong can survive