I don’t think you need an amendment for that. The Supremacy Clause and the Tenth Amendment support the Constitution and laws “in pursuance thereof” as the Law of the Land. There is nothing in the Constitution that supports a rogue, runaway unconstitutional federal government. And there is nothing in the Constitution prohibiting states from severing from an unconstitutional federal regime.
There’s a minor precedent, called the civil war, that makes those passages in the constitution toothless.
An amendment making secession a very explicit option doesn’t necessarily guarantee that the feds won’t stop it, but it’s much less likely that they would.