If your stepfather is beating your mother, do you think that if you ignore the situation, your stepfather will approach you to make a deal? Doesn't that sound ridiculous? Where is the pressure to change?
If the choice is advocating for yourself or not advocating for yourself, I think it's pretty obvious what the more effective method is. If you don't like the current Dems in power you have the option to primary them for someone you find more suitable. Unfortunately only one of the two major political parties is even willing to hear us out, and so we're forced to work within the system. No one said it's fair, it's just the situation we are in. Only way out is revolution.
To add on to what
@NYC Rebel said, in lieu of economic power you could also try organizing. If you could build political pressure at the local level and find a candidate who is willing to work with your group, you can then use that candidate to put pressure on the rest of the establishment. Showing you have a motivated block of consistent voters is the best way to have your voice heard. It's the reason union voting blocks have so much sway. Obviously money is still the best way to get a say, unfortunately, and starting up a legitimate grassroots campaign is waaay easier said than done, but there is a number of ways to advocate for the causes you believe in and every single one is going to be better than refusing to participate altogether.
You're making the assumption that convincing a voting block to stop voting is going to magically earn you negotiating power somehow, and that's the complete opposite effect of what will happen. Most of the country does not vote, and when candidates are seeking to appeal to voters, the non-voters get ignored. It's a method that's been proven to be the most effective. It's the reason Dems tend to trend rightwards in an attempt to persuade so called swing voters rather than trying to galvanize non-voters.
A lot of people have been very patient in explaining why your idea makes no sense, including myself. If you actually care about wielding political power for causes you believe in, then there are many people in this thread who would be willing to help you figure out the best way to do that. When you deflect and refuse to engage though, it just makes you look like an agent trying to manipulate people into not voting for nefarious reasons. If you really do have policies you would like to see enacted, what are they?