The core legal principle to know is that the delinquent tax debtor has the right to live on the property until your tax lien matures.  

Additionally, IF corona comes back in the fall/winter, I don't believe people will have had enough time to repay debt or build up savings to go through another round.

Joint and several liabilityIf you are two or more persons, your obligations as debtors are both joint and several.14.

Can anyone foreclose on a property or does it have to be the 1st debtor?

Further, any bankruptcy filing automatically stays foreclosure, the mere filing will stay the foreclosure the usual 90 days the debtor has to come up with a preliminary plan, a 60 day extension after that would usually be granted by the court.  

There is no subordinate debt or liens on the property and there is equity.

., Just like inflation, it would be good for debtors but bad for savors.

That is a rule that says the property is owned entirely by both parties and unless both parties are liable for the debt, then no debtor can attach any part of it. 

Should I hold and start paying off debt or go for more?

JUST BECAUSE A CREDIT REPORT DOES NOT LIST A DEBT OR A CONTINGENT LIABILITY THAT IS NOT A JUSTIFICATION TO MISLEAD OR LIE TO A LENDER ON THE APPLICATION OR IN THE APPLICATION INTERVIEW.