Delinquency is a timeline, not a single event
Every state handles unpaid property tax differently, but the pattern is broadly similar: the bill becomes delinquent, penalties and interest accrue, the county publishes or offers the debt, and eventually a tax lien sale or tax deed sale occurs. Many states then allow a redemption period.
Where your parcel sits on that timeline determines what is still possible. Early delinquency is routine and usually straightforward. After a tax deed has been issued, ownership may already have changed, and that is a different conversation.

