Start by completely DEFUNDING them with any federal dollars. The arrest and prosecute the core actors.
Justifiably, many on this thread express skepticism, as for example, eagleone: “Short of arresting mayors, governors, cutting off tax payer aid, etc, nothing will happen.”
As a form of encouragement and a call for patience, I suggest that we remember the liberal/left tactic of “incrementalism”. They understood quite some time ago that an all-out revolution would not succeed; there would be too much opposition to such an approach, whether done politically or at the point of a gun. So, following their thought leaders like Gramsci, they began the “long march through the institutions.” They would gradually destroy from within, incrimentally pushing the line of cultural and political acceptance forward until we have sanctuary cities in open defiance of the Federal Government, promotion of transgenderism in schools and libraries, university speech codes and open coup attempts on the president, even in the hallowed halls of the FBI and Main Justice.
This process cannot be unwound in a day or a month or even a year. It needs to be reversed the same way it came: incrementally. I think President Trump stopped the forward movement to the left and has started to shift the direction completely: He smashed Political Correctness, brought the fraudulent media to utter disrepute, he is hitting the regulatory state with body blow after body blow, promoting American exceptionalism and military, economic, diplomatic and technological dominance. But notice that he didn’t attempt to do everything at once: he has been pushing day by day, week by week, month by month, with amazing patience and persistence. Momentum is building but the whole de-revolution back to American greatness will not happen overnight.