You’re right that the answer isn’t easy, but there is one and the Democrats have known it for some time, they’re just not willing to do it. First, look at the driving force of anti-trans sentiment. It’s economics. Trump and the like redirect the righteous anger people feel about their economic situation towards minorities by creating a narrative that is easy to understand and plays into pre-existing prejudices. The Democrats could do the same thing but direct the anger towards the wealthy instead of minorities. People have pre-existing prejudices towards “elites,” and the narrative that the wealthy are the cause of your suffering has the advantage of being true. If the Democrats did this it wouldn’t matter if they also go to bat for the trans community, because the average “anti-trans voter” doesn’t actually care that much about trans issues, but are rather using the trans community as a stand-in to recieve their anger in the absence of a more compelling narrative.