Republicans have control of everything. Let's see if they get anything done in the next two years. I doubt it will be much. Everything Trump will end up doing will be via Executive Orders. The problem rests with the Senate, where it requires a 60% vote to pass anything. Without a voting majority, just about nothing gets done.
The effort by Musk and Vivek will be good for the USA, getting rid of some of the bureaucracy, and that is if the courts don't get in the way.