I'm new to this thread, but the GOP is going to continue to do well in Gubernatorial elections. They will dominate the Senate. It's already evident that McConnell is moving the party back to the Obama era Republican playbook.
Voters will not punish the GOP, as punishing the GOP means voting for Democrats. This tantamount to a rejection of their very being.
My prediction is that by 2024 the GOP will recover, while using Trumpism for certain elections where it fits. By 2028 the GOP will return to the subtle-racist policies they've championed for decades (replacing Trumpisms' open racism). The GOP is like the Borg, they aren't going anywhere.