You are dead wrong to imply a single vote can not or has not made the difference to win elections. Even if the national isn’t decided by a single vote local votes matter and they are where these razor thin margins are prevalent.
The only way we will hear the actual voice of the people is if everyone who can speak does so.
Lastly, what is the harm in voting? It takes very little effort, especially if you are in a mail-in state. It could make some difference, that makes it worth it easy or not