Congress should not get to set their own salary. They should be locked in at O-3 pay scale.
They should not be able to lobby for anyone or anything at any time, before, during or after their service.
They should not be able to exempt themselves from laws/regulations.
They should work year-round, 40 hours a week minimum, with productivity standards and the same benefits as the military.
They should have no expectation of privacy, nor any number of other civil liberties. They give up their rights while they are in office, and if they wish to invoke those rights, they are immediately evicted from their position.
They should have a full understanding of the subject matter upon which they are legislating. Those who do not fully comprehend the subject matter should not be allowed to vote on said subject matter. IE, illiterate fucks who don't know a sling swivel from a grenade launcher mount have no business writing laws on firearms. Those of you who remember the picture to which I am referring fully understand my sentiment.
There's a literal fuckton of other regulations that should be enacted to prevent the kind of SNAFU we have going on in DC, 17th amendment and others, but we'll never see any of them in our lifetime.