Either herd immunity or vaccinating all people in the long run
To avoid a second peak in the winter, Vallance said the U.K. would suppress the virus “but not get rid of it completely,” while focusing on protecting vulnerable groups, such as the elderly. In the meantime, other people would get sick. But since the virus causes milder illness in younger age groups, most would recover and subsequently be immune to the virus. This “herd immunity” would reduce transmission in the event of a winter resurgence. On skynews Vallance said that “probably about 60 percent” of people would need to be infected to achieve herd immunity.
https://www.google.com/amp/s/amp.theatlantic.com/amp/article/608065/