What third party? The abusers at PSL? The hypercapitalists at the Libertarian Party? The sixty-nine bajillion centrist vanity parties started by failed politicians who are such vapid losers that they couldn't even hack it in the centrist caucuses of the big tent parties?
Again, even if there was a third party nominally worth voting for, voting is a small waste of time, and electoralism is a tremendous waste of time, for the simple reason that States, in particular liberal democratic ones, are structurally incapable of bringing about anarchy or even approximating anarchist ends. Even if voting was somehow capable of imposing positive change upon us, it violates the principle of means-ends unity.