Apocalypse: the strongest healer

As a cleaner with no abilities, Abby had an accident at work. Tied to the system, she became a healer, but the ability was not a gift, but the beginning of a brutal trial.
In order to survive, Abby has to complete the tasks the system gives her. As Abby\'s abilities improve, the tasks given to her by the system become increasingly difficult. Time and again, when Abby was in danger, someone showed up to be by her side.
Abby looked at the man in front of her, \"General, why do you always show up for me when I\'m in danger?\"
William smiled, \"The awakened have a duty to protect every citizen. And protecting you is my life\'s responsibility.”
What exactly is the final task assigned by the system?
Can the devastated planet be revitalized by Abby\'s tireless efforts?