The world has just gone through a catastrophic disaster. Millions have died. You are a survivor, and people are willing to listen to you. The first order of business is to start rebuilding. What would your dream society be like?
I don't think any of my dream societies involve a post apocalyptic scenario.
It would be all about securing water, food, shelter, medicine, and other resources, and fighting diseases and cold and hopelessness. There would probably be a lot of enemies out there too. Life would be hard for a very, very long time, for many generations.
I don't know why people would listen to me in a post apocalypse. I'm not a survivalist. If they did, I'd just say we have to stockpile some water, food, medicine, shelter, resources, etc, and remind people that they have a better chance if they work together.