Focusing on this as a protest non-vote is your myopia. People who are disconnected and disillusioned by politics are not consciously deciding to not vote - it’s not important to them because the perception is that both sides don’t give a fuck about average people’s issues.

Those people are taking care of their kids, grabbing an extra shift at work to make ends meet, worried about if they can cover the next hospital bill/broken heater, etc If you cannot demonstrate to them that voting every 2-4 years actually improves their lives materially, they are going to continue to work towards improving their life without getting involved politically.