There are loads of teachers, librarians, sports coaches, parks employees, etc, etc that can’t do their jobs due to COVID. Those people could be doing contact tracing.
I don’t think the other ones exist in significantly large amounts to be meaningful and even then, keep in mind that furloughed people are not getting paid. The money has to come from somewhere to start paying them for whatever again, and states and cities have limited funding resources even before COVID blew a hole in most tax revenues.
The only entity capable of nationwide deficit spending is the federal government, which seems unwilling to step up to the plate.
The feds have decided to prioritize the economy in an election year, for some short-sighted definition of a good economy. And the party in power has never liked a strong federal government anyways.