It’s really important to remember that the GQP is a minority party. With a few exceptions (like Wyoming), even in places you think of as Republican strongholds like Mississipi or Alabama, they are a minority party. If even 70% of eligible voters vote freely, even there, they lose.
Ultimately, it doesn’t matter how their base writhes to forget or forgive how bad their candidates are. What matters is voting rights and voter turnout.