Right now? Protest against the Senate rubber-stamping his appointments, not holding him accountable, and letting him call the shots in Congress.

And before you say "but they've not done any of that yet", that's the point. Why would you wait for them to hand the entire country over to him before protesting it when that's the agenda he has and they've been signaling they're onboard with it?

Trump is already dictating terms for what the Senate majority leader must do. As if he should have any say in that decision. One of the terms is that they must allow recess appointments so he can fill his cabinet with no input or vetting by Congress. This alone is an unprecedented power grab. Tell them not to let him have his way.

He wants to fire career postings and appoint loyalists, converting tens of thousands of nonpartisan positions with ones beholden to him. Tell them they need to pass legislation ensuring those positions are protected from that form of meddling.

Shit, generally protest against the senators who failed to do their job 4 years ago allowing him to be elected in the first place. Or protest against confirming a president elect who's ineligible to hold the office due to his part in Jan 6 per the 14th amendment.

Will it change anything? Probably not. At least not directly or immediately. But that doesn't mean we shouldn't be doing it anyway.