Here is a suggestion that may get downvoted.  I make it not because it is a good idea, but because some modification may lead to a good idea.

Get everyone sick to get better.

If you hunt down my WordPress blog (grpaseman) you will see a mild expansion of this idea.  The crux is to interrupt the replication of SARS-CoV-2 by introducing a different virus whose systemic effects are known , are not fatal, but use the same resources that SARS-CoV-2 would use to replicate. This might delay replication inside a host long enough for the immune system to manufacture a response.

The idea has problems and needs thinking through. If it suggests a better path to interrupt replication at a different level, it will be worth all the down votes.

Gerhard "Getting Downvotes To Inspire Others" Paseman, 2020.03.26.