Anyway, if the GOP wants to claw back ground in these areas, they need one of two things, but preferably both:
1) Trump not being president
2) A Democrat being president
As long as Trump is in office, it's only going to keep getting worse.
That assumes the Democratic President would pursue policies anathema to those voters. Based on the track record of Democratic Presidents and nominees since 1984, at least, there’s no reason to believe that’ll be the case. The trend has been for these voters to slowly move into the Democratic Party; a trend that has only sped up under Trump.