Plenty of great advice here, but one more thing to think about is how such a large win for Republicans can be used against them a bit in the future. They won the Presidency and have majorities in the Senate, likely the House, the Supreme Court, and governorships. They have free reign to do what they want, which is scary, but it also means that they can't blame the Democrats for any bad things that may happen in the next 2 years until the midterms.

Any law that passes with bad outcomes is solely their fault. If the economy gets worse, it's all on them. If the deficit increases, they are the only ones to blame. If they don't fulfill their campaign promises, it's because they chose not to. If there is a government shutdown, it's because they couldn't agree on a budget. If bills aren't being passed, they are arguing too much. They can't even fall back on blaming the Democrats in the Senate because they have enough votes that they could cancel the filibuster while they are in office and reinstate it before they leave.

This means that you, and everyone else, can point out anything the government does that has a negative impact and say definitively that it is entirely the fault of the Republicans. If this is done frequently enough and loud enough, there may be enough frustrated voters to change the outcome the next time around. They will definitely do things that annoy almost every voter, whether they are going too far or not far enough in their agenda, and they can't hide that it was only them that made those decisions.