Wastesweeper

Zhu Ning, a warrior who slayed in all directions in a zombie apocalypse, unexpectedly dies and is transported to a wasteland filled with unknowns and fantasy. She becomes a fifth-class citizen, the lowest rank in the world, forced to make a living by "scavenging garbage." However, she discovers the strangeness and danger of this world in her work: various bizarre polluting monsters, the world's strange operating rules, and even her own strange self… Zhu Ning gradually uncovers a huge secret hidden behind the world, which also brings her immense danger. In this unknown post-apocalyptic world, Zhu Ning is forced into complex conflicts, searching for the truth about herself and the world.

(Source: Bilibili, translated)