The polls are increasingly dire for the GOP. They're even losing the military vote.
As awful as it is, this is what America is now.
You also seem to be ignoring all the systematic changes that have been made during Trump 2 in your prediction for such huge wins for the democrats. Things like the final destruction of the Voting Rights Act and the extreme Gerrymandering have gone mostly towards republicans. Also 32% of voters (or more) still don't really see a distinction against Donald Trump and The Almighty. Forgive me but I'm not convinced it'll be the bloodbath you think it's going to be. Democrats might have a minor edge in the house when all is said and done and literally nothing else to show for it.
† But it might not, if you turn five 7/3 R seats and two 9/1 D seats into six 6/4 and one 9/1 you risk a dummymander where too many of "your" voters vote the "wrong" way and you have seven Democrats elected even though you still took almost 50% of the vote in some districts and you drew the maps.
Now the trouble is that voters seem to be imagining that if the Democrats take the Legislature that's the whole ball of wax and it just isn't. If there's a narrow D majority in both parts of Congress you can expect that to stall the stupidest stuff from Trump which was subject to congressional oversight, but the useless "We need bipartisanship" mewling will start almost immediately from people who apparently were 100% fine with party-line Republican decisions or executive override.
When it became clear this was happening some gerrymandering attempts were aborted, for example in Indiana.