Not supporting electoralism means the communist parties shouldn't spend their time and energy trying to win votes or changing their program to appeal to more voters. It doesn't mean you shouldn't vote for a communist party.

Electoralism is one of the reason why many communist parties diluted and destroyed their own programs, but no communist party, principled or otherwise was ever like "don't vote for us". That's just defeatism and laziness.

Please read "Leftwing communism" by Lenin. I'm a leftcom and it's so funny people tell me to read this book without ever reading it themselves.

Voting hardly takes a few hours. In terms of hours invested vs potential result it is one of the best things you can do.

Next time, vote for the communist party, wherever you are, regardless of chances of winning.