When Reagon won, after Democrats completely abandoned the New Deal as well as its success, they learned the completely wrong lesson and began chasing Republicans further to the right as they believed they needed to appear more moderate in order to win elections. This cycle continues to this day.
Nowadays, Third Wave Democrats continue doing the same thing — instead of recognizing that all major losses come from dropping well supported and progressive policies, they continue chasing the new (far right) center. All of this whilst having ironically arrived at doing Reagon era economic politics, which Republicans nowadays call “radical leftism”.