I expect the horrible candidates the RepubliQ have chosen to cost them the Senate. I imagine the most likely result is that it remains 50-50, especially since there are a couple of races where Democrats have a decent chance, where they didn't before.
The House--a LOT closer than everyone expects, but I still think the RepubliQ will win, because of the severe gerrymandering involved.
I'm not going to predict an unlikely outcome simply because it's what I want. The carefully and unethically crafted RepubliQ campaign to keep non-white people from voting (or having their votes count) will be successful.
If not for the "success" of the RepubliQ Handmaid's Tale campaign, they would take the Senate, even with the goobers they've nominated.