If I had any kind of power, I would create a group of serious, old school and rational republicans to say "enough is enough" and build bipartisan support for changing the party and undoing some of this damage.
But even Lindsay Graham started saying Russia stuff might be fake news (Jared backchannel story).
I think that party is too far gone for restoration or recovery. They may continue to win on gerrymandering and razor thin racism margins for a couple of decades, but demographics are going to kill that party and nobody is doing anything to make it better.
Democrats hand wringing themselves into a tizzy trying to come up with "one simple message."
I don't want a party that operates on "one simple message" and I vote for a party that bases policy on rationality and real-world complexity.