Even in such places you can affect the outcome else where through activation if you're privileged enough so you can travel or talk with people online. Not everyone can ofc!
As for the latter, esp the "even if everyone who didn't vote voted it wouldn't change!" Isn't what I'm saying.
What I'm saying is "Work to change what you get!" There's a big lean to Democrats, ok. Are there better options to pick from within those Democrats? If you want a more left voice, would it be possible to outflank them on the left for local stuff?
Democracy is a process, voting is a fairly minor part of it.