Just kidding.
Maybe kidding? Seems the only way to get a single-issue topic on the agenda these days.
The signal in traditional voting is very diluted.
You vote on a person that you think supports some of the things you care about. You are not allowed to weight in on individual issues in a way that matters.
The person works for several years, and the only feedback you have on that process, the only tether that holds that person accountable, is whether you vote for them the second time.
If you are in a first past the post system, and in a safe seat, vote for one of the no-chance-of-winning candidates who best represents your views. Although they won't win, the fact that they are getting votes will be noticed and the main 2 parties will respond by adopting some of their policies. E.g. in the UK as more people vote for the Green party, other parties will become more Green to get those votes back, even though the Green party has only ever got a single MP.