So since the Supreme Court is corrupted, our national legislature should just give up and not even try?

They literally did try; I just presented you with evidence that they tried: the Freedom to Vote Act. It had enough cosponsors to pass the House and the Senate; it died due to the filibuster.

So go ahead and tell me what your plan would've been; I'm listening, because you forgot to express one. And if it involves removing the filibuster, 1) that legislation is in the exact same territory as the Voting Rights Act (legally for what the SCOTUS is allowed to do to it; in terms of judicial precedent, it's far worse-off, because holy shit, we're talking about the fucking VRA here), and 2) I dare you to imagine what a 53–47 Senate, a 217–212 House, and Trump could do without the filibuster. I will tell you it's unfathomably worse than what's already happening, and I will also tell you that "well it totally wouldn't have happened with better voting rights!!" is just 1) credulously assuming it wouldn't have already been struck down and 2) not a solid assumption even if not.

Is your plan to delete the filibuster before absolutely flooding the zone with voting rights legislation in hopes they can't strike it all down and fuck voting rights precedent even worse? Good thinking, Mr. Brannigan; SCOTUS-bots have a pre-programmed judicial review limit, after all. (They do not.)