Not voting isn't merely sitting on our asses and virtue signaling.
It's talking about ideas and how to go about doing things without the state, which predominantly involves talking with those who hallucinate the necessity of the state because such a belief is so omnipresent, making other forms of action very hard to do, since government prevents competition and anything other than its monopoly, which, at core, is enabled by the perception and belief that there's nothing wrong at all with what the state does and that its theft is necessary to keep society going.
Literally, the amount of change proposed by voters is sitting on their asses and subsuming their individuality into a faceless mass of others to be considered in a purely mathematical way ("I am not a number!") that's literally designed for people to cancel each other out (3000000 votes for Hillary and 3000000 for Trump functions exactly the same as 1 vote for Hillary and 1 vote for Trump).
The only difference is when the voices of one of the faceless piles is altered by the addition of faceless numbers that make the ratio greater than 1:1 for the favored candidate.
Except that it doesn't because the electoral college decides who the president is.
All the while, legitimizing the idea of the necessity of a ruler.
So it's a net negative action.
You would do more for humanity by staying home and masturbating to porn, literally doing nothing, sitting on your ass, or just laying in bed.