The party stopped being true to itself and started trying to emulate the Demonrats.
Solidify your base in the south. lest the party loses them to a 3rd party. Focus in on winning back the voters in Virginia, Ohio, Pennsylvania, Indiana, and Missouri.
The GOP is never going to win on the east or west coasts, so forget about them.
A party that can't win on the East or West Coasts eventually won't be able to win anywhere. Reagan's coalition was built of people with very different priorities but one common theme: "Government is too big and powerful, and it's hurting all of us. If we band together we can limit its power and help all of us." The GOP has to get back to that central, unifying theme, or it has no reason to exist. You get what we have today: a "Ban Abortion" party, an "Old Country Church" party, a "Blow Up Iran" party, a "Gun Show" party, a "Country Club" party and a "World's Biggest Corporations" party wearing the same lapel pins at a convention, but having virtually no goals in common.