Cheer! Because with 28%, you are close enough to herd immunity that you can push R0 below 1 with social distancing.

In fact, herd immunity does not require 70% of the population to be immune. It just requires 70% of all potentially transmitting contacts being eliminated. And if those 28% who contracted the virus first are also the ones that have more contacts than average citizen (which should be the case, because that is why they probably got it before the other 72%), we might already be fine. Let's these 28% have 72% of all human contact (because human is -like almost everything - not distributed equally), then we would already be there and have reached herd immunity. There would still be sporadic local outbreaks, but nothing dramatic any more.