A virus broke out in the year 8022. By 8026, four years had been enough to turn the world upside down. Humanity had gone from being the master to becoming prey, struggling to survive. That contrast needs to come through. Cities have become ruins, and mutated creatures roam freely. These are standard elements of an apocalypse story, but you need to include specific details, such as what the mutated creatures look like. You don't have to describe them in too much detail, but make them feel terrifying and unknown, echoing the mysterious nature of the DA virus.
