I still vote, because while a single vote by itself doesn't make much of a difference, and even which flavor of shill who wins doesn't make much of a difference, the fact that a population votes does (I think) make a difference, regardless of the outcome.
If we collectively don't bother to vote, then we the people become all but irrelevant.
If you're too disgusted to vote, it's probably because the votes for people are between two equally repugnant choices. So go out and vote "anyone but those two." Vote third party. It doesn't matter what third party you vote for, because what you're really doing is showing up. It's a holding action, to preserve the vote, until we've figured out how to make it work again.
Think hard about holding on to your right to vote. Right now, in Congress, they still hold "voice votes," where individual votes are not counted, and instead the person running the vote decides based on the volume of "yeas" or "neighs" which side of the vote won. Before modern technology there were practical reasons/excuses for this practice, but now it's just a way to a) allow voting members to be anonymous, and b) the leadership to have undue tie-breaking influence. And it's lazy.
Who's to say that Congress won't eventually grow the balls (or have paid balls attached) to declare that they know how a district would vote anyway, based on blah blah blah, and just declare winners, because people aren't voting anyway.
At least force them to continue to lie. Don't just give it to them.