Well...
We have one last hope is a clean sweep next election cycle. IF that fails...
Constitutional convention. If that fails...
Armed insurrection / separation movements out of the USA.
Yup, If it happens that Trump is unable to drain the swamp then as a last resort he could let the states know that if they vote to leave the union he will not object.
I have long said that the only way the nation could split apart without bloodshed would be if it were done when a Republican was president and was with them.
The Republic Of Texas!
Trump could become the President of Texas :-)