Congress has to start working for the people it represents again, so I really hope the Democrats start pushing lots of legislation that addresses the real needs of the people. Even if every bill gets vetoed, make sure Trump and the Republicans around him own the lack of progress in a very visible way to ensure 2028 is an easy-mode Democratic win.
But... they also have to undo the damage to the rule of law that has been supercharged by the Trump administration.
Letting bygones be bygones and trying to move back to the old status quo without addressing actual wrongdoing is how you end up with Trump getting reelected even after January 6th.
If you spend years (correctly) telling people the current cronyism and open corruption is destroying our democracy, you have to act like it really was when you regain power and that means investigating and punishing those who took advantage of it, where just and applicable.