We know how to do it, we already have Medicare and all of the first world countries have proven that as long as you give funding to the medical industry, public health care works, the same as libraries receiving funding or fire departments receiving funding.
You can take a look at any referendum to see how specifically we would transition to that system, but it would basically be expanding Medicare to Medicare for all, and later removing the remaining restrictions for pre-existing conditions.
It would be a very simple transition, and more productive for the country and cheaper for everyone.
The only reason we’re not doing it are profit driven motives by people making money off of the private health care industry.