You have been preparing for years, and now it comes. Total economic collapse, some super volcano goes of, ecological collapse, whatever. It happens.
The world is a mess for about a few years, billions die due to direct and indirect consequences of the disaster. Entire nations have failed and collapsed, industrial chains have failed and collapsed, etc.
But you are one of the few (250 million or so) survivors worldwide. You have prepared for all this and come out of your hiding place finding countless rotting corpses, entire cities in ruins, nothing works anymore (except for the renewable resources you have managed to maintain).
Now what? Rebuild society of course, with the few survivors in your area. What should happen then? How should that be worked out?
What should society look like?
What should humanity use for governance (if any)?
How should the economy work? Should we turn back to currency for trade or are there better options?
How to deal with the disabled and elderly?