Wait 2 years, and hopefully put people who will mitigate the damage into the positions listed on your ballot. All you can do now as a law abiding citizen is wait.
I fear that the next election will be more ceremony than democracy once they have finished rigging it. At this point, I expect a third term for Trump - if he lives that long.
Your fear of a 3rd term makes it all the more important to vote in your future elections. As the two term limit is imposed through a constitutional amendment, they'd need to create another constitutional amendment to reverse it. They need 2/3rds of both the house and the senate to agree to even get the ball rolling, as such, it is vital that you do what you can to prevent them from acquiring those numbers to avoid that situation.
If it did happen, I wonder if the democrats would run Obama again.
I know the supreme Court is heavily biased at the moment, but what possible logic could they use to get out of the 22nd amendment saying "no person shall be elected to the office of the president more than twice"? They can't just add words there, and it isn't ambiguous at all