> pandering to the Republican-light voter base

Its not that you have to appeal to them. Feel free to have policy positions and to stand on those. You might even get some people on the other side to agree with you on policy.

Instead, the losing strategy is doing what the OP is apparently doing, which is preemptively dismissing half the population, wholesale. Defining yourself as nothing, exempt as a hating half of the country is neither a real policy position, nor does it gain much.

> Zohran Mamdani is doing so well

He is doing well because he is standing on values. Not because he spends his time saying that he hates half of America. I'm sure he would be happy to get republican voters who move over to his side and agree with his policy positions.

have policy positions and to stand on those

As if activist conservatives won't simply lie about them. Yes, in an ideal world everything would be evaluated on the basis of policy by rational actors using objective criteria. In the world we live in bad faith abounds, and voters aren't very attracted to candidates who are long on integrity but allow themselves to used as a punching bag in some sort performative political martyrdom.