There are 2 conditions that may keep the GOP in last place for a long time, regardless of who they run.
The 1st is the media. Back in the Regan, Bush campaigns, the media was not 100% in the tank for the left.
They were of course partial to the left’s candidate, but today they’re not just partial for the left, they cheerlead, while openly oppose the right’s candidate, with repeated lies, rumors and denials of any of the oppositions truths.
The 2nd problem is that the GOP voters demand their pick for candidate wins, or they vote for someone else, or stay home. A rather juvenile approach, but proven in November.
While the voters on the left all have a common goal of more of your money and will put up with anything to get it.