Heck, much of the Bill of Rights is instructions on things the representatives of the people are disallowed from doing.
Certainly in the way they're manifested at the moment they're one of the less democratic elements of the state, but if you can't think of better examples of anti-democratic things then you lack imagination
It is called “amending the Constitution”.
The SCOTUS strikes down unconstitutional laws and is appointed to interpret constitutionality, by the Constitution that was ratified by the American People.
But the American People are the ones who originally ratified the version of that thing that annoys you so much and the American People were the very people who said that’s what SCOTUS needs to look like. (There is a dead giveaway in the first three words! Damn!)
Maybe we can just call in RuPaul to redesign their robes or something. Queer Eye For the Judge Guys. That could do the trick.
If the American People decide that we need laws that conflict with the Constitution, or that we need to abolish/reform the Supreme Court, then we simply ratify Amendments to do what the American People need done. Easy peasy, bro!