If the Democrats win control of even part of Congress next week, Trump can expect lots of attempts to build guardrails against further abuses of power. There will be investigations, blocks on nominees, litigation over impoundment, and government shutdowns. How will he respond?
He already has a playbook for this situation. He will stonewall the investigators, force them to litigate, and run the clock out in the judicial system. He will rely on acting and interim subordinates instead of nominees. He will do his best to keep any litigation on impoundment from reaching the Supreme Court. Finally, he will blame the Democrats for any inconvenience created by the shutdowns. History tells us these tactics will probably work.
The only exception will be judicial appointments, particularly to the Supreme Court. There are no acting or interim justices, even for him.