“Conservatives” is a misnomer here. “Conservative” isn’t right and “Progressive” isn’t left.
Conservatives are those who want as little change as possible so as to “not rock the boat” and “if it ain’t broke, don’t fix it”. Progressives are those who want to try out new policies.
From what I gather, a large portion of today’s Republicans aren’t actually conservatives rather regressive. That’s almost literally what “make America great again” means. That’s also the meaning of, for example, the Roe v. Wade overruling - going back to an earlier state.
Also, in the long run the human condition generally changes for the better (Or at least that’s what we perceive as our values and habits are usually aligned with what we have now and not what we had before). As the status quo changes, the things conservatives (and progressives) value change accordingly.
Saying “Conservatives were the people who defended King George.” as if that has anything to do with conservative today is like someone saying “Progressives on the 18th century were for women’s suffrage, they have no business talking about equality”.