Isolate the corrupt, decadent, anti-American counties. Return them to territorial status, under the control of the Federal Government, but without the status of states, including the vote.
Send in Federal troops, combat-hardened Marines, and eliminate the treasonous bastards.
Under Section 3 of the 14th, their insurrectionist politicians and judges can and should be removed from current office and banned from future office, now.
Under Section 4 any debts or obligations incurred in aid or insurrection can and should be voided. The lenders supporting such activities should be reminded any such investments are valueless and unenforceable. Those responsible for institutional investing in their support should be removed for failure of their fiduciary duties. I'm not sure whether Section 4 can be extended to state and local tax obligations, but it's worth investigating. Section 4 also bans slavery reparations.
Section 5 gives Congress the power to act on this. Alas, it will take new leadership and reinforced pro-American majorities to give it the will.