If they try again to do another January 6, or if they had tried to go further last time, they would have been met with force of the US military and they would be absolutely crushed.
Also, the Civil War was organized and planned in secret, long before the NSA and FBI existed, predator drone and hellfire missiles. I don’t think another one could get far enough along to pose an existential threat.
The capital insurrection ended exactly how a 3%'r civil war would end: they’d smear a bunch of shit on the walls until one of them fucks around and finds out, and then they’ll hide their faces as they scurry away out the back door, back into their mom’s basements and motor homes.