Yeah, that's the thing. Even in the most optimistic of dreams, Democrats won't end up with supermajorities in both the House and Senate. They can pass whatever bills they want, but Trump doesn't have to sign them.
Sure, there will be things that Trump wants to do that he might actually need Congress for, and maybe there's room to make deals to advance some kind of progressive/liberal policies here and there. But I don't think this will slow Trump down too much, honestly.
And in 2028? Who knows what the state of things will be by then. Maybe we'll end up with a non-shit president at the start of 2029, but what kind of executive branch will they be inheriting? It would take an entire presidential term, possibly two, to undo the damage Trump and his shit-heels have done. And even then, it will never be the same, not to mention reputational, economic, and scientific losses that will -- at best -- set us back decades (if not permanently).