Don’t just stay home.
My brother and I are next week going down and changing our registration from R to I. Suppose that over a period of a couple of months 40% of registered Republicans suddenly disappeared? That is something the party apparatus would see quickly and long before the next election.
Beyond that, not much. Put a fork in the party it’s done. So’s the country IMO. But in any case, the bastards running the GOP are not selling out the Constitution with my implied approval, which is the current case if I stay registered as a R.
The impact on the GOP-e is nothing when you register I, in most states you will not be able to vote in either the D or R primaries. Cconcentrate on your local R candidate's by staying registered R, it's the only way to purge the Rinos out.