Governmentally? Not a lot. All the people who would be responsible for doing anything work for the people doing it. All the people who are supposed to have oversight either agree with it, or we’re just put into the minority by voters.
The only real options available are for someone to sue in a federal court and hope they get a judge who isn’t a trump appointee.

Outside the government? Legally, this is what the election decided the nation wanted, and there isn’t much that can be done.
Anything outside the scope of legal action isn’t going to be discussed online openly. You see small snippets of data being backed up to archive services, so you know that there are people doing things, but if you’re doing something outside the scope of what the administration wants, you keep quiet.

Nothing. The government isn’t acting. I do not believe there is any useful legal avenue left. That just leaves civilians and other nations. Most civilians are completely powerless and other nations aren’t going to get involved unless they are dragged into the mess. Image Nazi Germany except they never invaded Poland. The countries in which Fascism wasn’t taking root were happy to look the other way and make concessions. Things are likely to get much worse before they get any better.

I’m sure the DOJ is on this and working on a case. /S