We can't because they won't let us. The rich people they worship tell them not to listen. If the left does something to better their life, their overlords take credit or tell them why it's actually bad. If the right does something that makes their lives more miserable, they explain that it would have worked if not for those liberals or minorities or whatever.

Nearly all my extended family was rural south conservatives. They're selfish people.

If everyone is a result of their circumstances as the left claims (and as much of the research claims) then be the change of those circumstances you wish to see. Expose these people to the thinking and information you believe to be so transformative and true

And all you've done is demonstrate that you don't understand what the left is fighting for. We are (probably the only ones) fighting to change the circumstances. Those benefiting from those circumstances, aka the capitalist, white supremacist, patriarchal, ableist, cis-heteronormative status quo, even if very mildly, being uncomfortable is a tiny price they're just going to have to pay, because prioritising the their personal comfort over change is how we got here in the first place.