Majority Republicans should put forward Constitutional Amendments to better protect the rights of the minority party (e.g. providing protections against executive orders that violate separation of powers, ensuring appropriate minority representation on Congressional committees, etc).
A sufficient number of minority Dems might support said Amendments to ratify.
When the Republicans are again the minority in the future, they clearly will need improved protections against Democrat authoritarianism.
Excellent points, Cockroach Magoo. Right on.