By “state-level separation”, you mean secession, right?
No reason to declare “secession” - just state sovereignty.
Declare unconstitutional laws to be null and void within the state, including any redistribution or social programs.
Enforce the non-enforcement of these laws,
and defend your state when the feds attempt to impose their will on it.
De facto “secession”, but formally, just enforcement of the 10th amendment and the Constitution as written.
The difference between such an action and the “civil war” would be a refusal to attack the feds unless as a defensive action.