Medicare for all.
Healthcare insurance is a "patch" on capitalism. It's there to fix a gaping hole in capitalism: nobody in a capitalist society can afford healthcare without insurance. Nobody. Capitalism may deliver the most, the best, the cheapest, the greatest variety of widgets. But it doesn't provide affordable healthcare to anyone, even the rich, without the patch.
It is monumentally stupid to let capitalists operate the patch on capitalism. Letting capitalists run healthcare insurance is like letting foxes run the henhouse.
There should be no such thing as "for profit" healthcare insurance companies: because there should be no profit in denying people needed healthcare; because healthcare is fundamentally unlike widgets.
Bumper sticker version: Medicare for all. Problem solved.