In terms of how to perform it for voters: Bernie Sanders on Joe Rogan
I mean that both specifically (watch/listen so you can hear what 202x American populism can sound like) and generally (replace "Bernie Sanders" with "a Democrat whose core desire is to advocate for the economic betterment of the poor and working classes while talking like a non-robot (like Biden/Trump and unlike Harris/Vance)" and replace "Joe Rogan" with "any major platform where millions and millions of reachable voters will pay attention regardless of whether or not that venue is socially acceptable").
I am someone who believes there should not be such a thing as a billionaire, but I don't even care about having any political party or politician advocate for what I believe.
In terms of a policy: "Every American should have free healthcare"
Not access to preferred advantage plan shopping opportunities via a friendly and easy-to-use app. You're alive in America and you need a thing, you get the thing.
When health insurance industry stooges step in to try and design some laughable plan that involves pre-tax income withholdings you, as the politicians, point at those corporations and you name them and you tell the people that those corporations, by name, are OK with them dying so they can make profit.
And that's important because the people already KNOW these private health insurance corporations are OK with them dying so long as they can stand in the middle and siphon off mountains of cash. You're not telling them anything they don't already experience and know. We, as Americans, live it every single day and DC actively encourages it.
So be the guy who will speak the truth on behalf of the people in the face of power.