Remember that even if the Republicans do manage to eke out a tiny House majority, they will have only done so because of some rather overt and blatant gerrymandering at the state level.
I'm from Tennessee, and I'm thinking in particular of that red state's latest map that precision-sliced the districts in and around Nashville so as to effectively wipe the city off the map.
As you can see here, all of Nashville's metro population has been parceled out into three rural-heavy districts.
That's right: Nashville, "the Athens of the South," the TN state capital, legendary capital of country music, perennial destination for bachelor and bachelorette parties, and the state's most vital economic engine and healthcare center has been effectively denied federal representation in the U.S. Congress.
This rigged map forced Jim Cooper - Nashville's moderate Democrat U.S. House Representative, who's been in Congress since 2003 - to not stand for re-election.
https://en.wikipedia.org/wiki/Jim_Cooper
Missouri Republicans did a similar thing in Kansas City, Florida Republicans axed 2 historically black Democratic districts in Florida, and Republicans would similarly wipe out every blue-leaning metro area in the country if they could get away with it.