Shoot what is important to you. Be emotional. Don't shoot what you THINK is important. Shoot what is compelling. Shoot what you are doing, what you see, what you dream about. Be personal, be vulnerable, and when you find something you are drawn to, but dare not look, that is the picture to make.
Above all, when you make a picture, don't 'take'. Give. You can give the descendents of the survivors and the rebuilders something to help understand these times. Your audience is 50 to 100 years in the future, not today.