After more thought, since this is not a complete hypothetical...
- massive distribution of KN95 and N95 masks for people who want to wear them. They are good enough to protect people even if they are surrounded by non-masked, with some reasonable additional precautions
- massive testing, especially via air sampling and waste streams, so we know the "Pandemic Weather", where it is surging. This doesn't depend on individuals getting tested. But also that testing too. Testing should be too easy.
- If the vaccines remain reasonably effective, like the current ones against Omicron and Delta, then a campaign to get boosted up with a 4th shot. If not, then Warp Speed II needs to happen to get a new vax. This will take time because it requires new trials, 6 months or so.
- Public messaging better. Have signs on highways, public alerts, etc., so people can make their own risk decisions
The big problem is the health system. With a significant proportion of the population not using NPIs and boosters, the already weakened health system will be crushed. Curious for your ideas on that.