1- make by law that the highest paid employee (or contractor) including bonuses and everything cannot earn more than 10 times as the lowest paid
2- tax. Tax income for the lowest incomes at, say, 20% and then let it rise in steps, each step part will be taxed higher, until it hits a point where anything above a certain level is taxed 100%. You earn more than that? Cool you're helping the government a great deal!
3- use all thatoney for universal healthcare, universal housing (if you can't buy a house, you'll get one), universal income. Also infrastructure
While we're at it
4- change political system from "winner takes all" to "each candidate with over 1% of the votes will get exactly that % of power but nobody gets more than 10% of power"
5- companies care size limited. Canoe have more than 1000-1500 employees or they'll be forcibly split
6- redesign cities for people, not cars. All cities should be walkable and cyclable and have great public transportation. Cars won't be prohibited but taxed higher. Nobody in cities wants cars anymore because they don't need them
Fun fact, we could have this right now just by paying what the UK pays in taxes at an individual level and most people and businesses would make more money.
Your employer generally covers 77-83% of your insurance costs, and insurance costs rise faster than wages or profits.
If your net expenditures on insurance+cost of service+cost of prescriptions (and, presumably, also the cost of catastrophic care, should it happen) is more than 18% of your income minus what your employer pays, because your insurance cost is part of your total comp, you make more under universal healthcare.
At that tax rate the gov could just pay for everything and leave the rest of the system (largely) private, only using it's market power to negotiate and standardize pricing, and everyone makes more money and has better coverage.