I don't know what else you expect honestly? Either you give the non voters something to vote for or you accept the status quo, either way gerrymandered districts will not be looked at again until 2030. The voters you are trying to change, i suspect will not as most are single issue voters that have been told since birth that their worldview they are taught is correct. It's not a matter of changing their mindset, you also have to contend with their entire world view is misguided, and that of their parents. It's an uphill battle that I'm not sure will be won within a generation or even two. Many of the same voters you are talking about were raised by the same people who fought desegregation. The apple doesn't fall from the tree. Hate isn't an implicit idea we're born with, you gotta be taught to hate.
Progress has to start somewhere though, and making policies that directly impact non voters is a sure way to turn them into voters for your platform. Writing off an entire area as a lost cause however will just deepen the divide and allow Republicans to push even more extreme platform positions because they get to virtually run unopposed at home. Their only danger is not being conservative enough and getting primaried.
I firmly believe the Democrats don't know how to capitalize on a win. The incessant need to compromise with bad faith actors dilutes any win they actually are capable of. It is a bedrock principle of a republic, but only when the other side is operating in good faith.