But the only way to properly do that is a constitutional amendment.
To give an extreme though-experiment example: Lets say Congress 1) packed the Supreme Court with yes-men, 2) passed law giving themselves a huge pay raise and delegating all legislative powers to the President, while they go party. Didn't it just create a a king/dictator? Wouldn't that be unconstitutional?
A constitutional amendment make it permanent, but Congress never actually lost control. They always had the power - and still do - amend, restrain, clarify their own laws.
> Didn't it just create a a king/dictator? Wouldn't that be unconstitutional?
In a scenario with a packed Supreme Court of "yes men" there are no bounds to what could happen, so why bother with the thought experiment? In your example, the constitution is already worthless.
If I may disagree: it was the legislature that gave the executive branch power, and the judicial branch that essentially approved such an arrangement (unanimously) in the original Chevron ruling.