I think the house is pretty much gone. Perhaps the only bright light for Dems in 2024 is that they minimized house losses and it actually ended up being pretty close with a couple republicans in bluer districts hanging on. Especially with Medicaid cuts and tariff stuff really kicking in by November of next year I don’t see how republicans hold the house.
The senate is a more interesting story and just like it seems to be every year it’s tough because of the map and the GOP’s rural advantage, but doable for democrats. As long as Kemp doesn’t get in (and why would he want the job?) I think Georgia is safe for Dems. I don’t think Republicans will win Michigan in an off year with Trump as president. Maine in an off year seems doable, despite Susan Collins being a formidable candidate. She says she's running but I won't be surprised if she changes her mind, at any rate I think with the right candidate it's possible. Similarly, an open seat in North Carolina makes it much more of a possibility for Democrats, especially if that lunatic who ran for governor gets in. Roy Cooper seems like an obvious choice for the Dems here but even then I would hedge my bets in NC.
Despite all of this, if everything works out for Democrats in the above states and they pull off four victories, they're still only at 50/50 with Vance as a tie breaking vote. It would still be a massive victory and basically pumps the breaks on Trump achieving anything in congress in his last two years, but a lot has to go right for that to work out. After that you're looking at longshots like Iowa and Texas, and if Democrats are winning those the Republicans might want to seriously look at getting on board with impeaching Trump because that means he seriously fucked up.