He will be massively impacted. Executive orders can be challenged and overturned by Congress. Using “Emergency Powers” as an excuse can be terminated by Congress thus voiding any order given under them. He has leeway over foreign policy but Congress declares war, not the President.
He, and many of his sycophants, will face investigations. Which will tie up their time and limit their activities. Impeachment won’t be attempted again unless a successful outcome is quietly negotiated first. Which, according to some informed opinion I have listened to, isn’t as far fetched as it might appear. Republican Sentators will increasingly want, and need, to distance themselves from Trump and MAGA, so abandoning the sinking ship and blowing holes in on the way out could be in their best interest. With the numbers as they look like being it won’t take more than a handful to reach the needed 2/3rds majority.