Imagine you had 72 hours before everything collapses. How would you spend that time? Would you stockpile supplies? Would you focus on warning as many people as possible? Would you try to preserve knowledge, like books, hard drives, download internet archives, etc.? Would you collect music or history?
Just get closer to the blast zone. There is a specific blast zone ring that you don’t want to be in. That are will rip apart you DNA slowly relative if you survive the fires.