Voting should be a minor part of political advocacy. Make noise. Vote for the parties that will listen to you and try to make policy in favor of what you demand. If they disappoint, kick them out of office by voting for the other guys or at least issuing a protest vote.

What voting does is it gives bite to all the rest of the political action one does during a term of elected office. It is what makes political speech effective. It does not replace it.