140 years ago, the world was nearly torn apart as rifts to other realms sprung up across the continent. Former societies of elves, humans, dwarves, halflings, and more were devastated, and now new settlements have risen. The crux of my question is this: How would new villages, towns, and the like rebuild after such an event? What needs to happen in order for the people to begin recovering?
Essentially, I want to know what it takes to move a world from a post-apocalypse into a sort of post-post-apocalypse. For some context, these realm rifts are the like of planes of fire, water, earth, air, heavens, hells, and whatnot. It also is a fantasy with Vancian-type magic and heavy Lovecraftian horrors.