A Good-for-Nothing Surviving the Apocalypse and Cultivating Immortality?

Outside, monsters are devouring people. Inside, a desperate besieged city ruled by a rigid hierarchy? From the start, it's: “Sir, your cultivation eligibility application has been denied.” Even spiritual energy gives me a wide berth! Want to cultivate immortality? Better hope you get born into a good family next life! Goal: Cultivate immortality. Difficulty: Epic hell! Protagonist status: Starts with one life, and has to scavenge all his gear!