If we're just talking Congress, they'll probably just gridlock most laws from passing without repealing much of anything.
For the presidency (+Congress maybe) I imagine they would scrap the tariffs and try to re-assert the US' position as global cop/guarantor of European security. Maybe restart some USAID type programs and end the DEI purge. Some EV tax credits and subsidies for offshore wind and solar power might return. I think the BBB funding for ice would stay in place bc they have been moving right on immigration for years. I kinda doubt they'd regulate crypto much harder, but it remains to be seen. We'll have to see who ends up the nominee and the dems will try to get the most run of the mill establishment candidate they can get.
I'm interested to see what they will even try with the changes doge made. Years later, will they put forth the effort to undo them and rebuild a professional bureaucracy? I imagine a good number of the cuts will continue.
No matter what, they will be very hemmed in by the supreme court. Real change comes from below.