Testing everyone, every day will isolate and eliminate any pockets of Covid.
Children should be tested before attending school. People should be tested before going to work.
There are less-than-1-dollar tests coming which just require some spit, probably called "lick-a-stick".
Keeping people like "young and healthy (how do you know?)" untested gives a perfect place for Covid to spread.
Listen to This Week in Virology (TWIV) https://www.microbe.tv/twiv/