Ideally you would immediately shut down everything and prevent the virus from even entering. With rigorous border controls and contact tracing you can prevent it from ever taking root.
Having failed that, one option is keep everything open and let people die. Covid is not that deadly, so it's worthy of consideration.
Another possibility is to deliberately make sure the young and healthy are infected. Preferably in a staggered way so they can be given care.
You could also consider making camps for the frail where they can stay isolated from the rest of the world while everything blows over.