Shield the at risk and yet younger people go back to normal-ish
Fix track and trace
Test only those with symptoms to free up tests
For a start.
So, at risk...
- Old people (what age do you cut-off?)
- Fat people (what BMI or measure do we draw the line?)
- Those with many existing/prior conditions
- BAME
So, many millions of people.
Who tends to their needs - food, healthcare etc? Who does their work for them - many will be teachers, healthcare workers and perform other key roles?
How long do we lock these poor souls up for?
What about all the young healthy sorts that you permit to go about normal life who live under the same roof as someone who is at risk?
All the young people happily going about their business will continue to spread the virus between themselves. With odds on their side, many will be fortunate enough to enjoy a reasonable outcome. Many won't. When you multiply up the small risk across those millions of people, many will get sick, some will require hospital treatment and some will die. Some will be at risk, but didn't know until Covid-19 came knocking.
I'll be honest, I'm struggling with your plan.