I’m a socialist, but I have a brain.
Anything you can think of to make wealthy people cease to exist is easily bypassed, so the best way is to find ways to tax behaviour instead.
The point of money is how you use it, if you have a 50,000x tax on super yacts and private aircraft, then the ultra rich are forced to pay your tax or try skirting around it by using smaller boats or coalescing their private jets into a private airline.
But if you tax stocks, then people will invest in other ways. If you tax individuals owning large property then they’ll move their property ownership into a company, if you tax inheritance then they’ll put the money into a fund instead which has debts that will be written off in time. All kinds of fancy tricky accounting.
The other solution is to tax everyone on unrealised gains, which makes every home owner (including pensioners) suddenly liable for huge ongoing bills.
Elon himself for example is pretty cash poor, but owns a lot of stock in a “high value” company meaning his wealth on paper is pretty extreme. He takes on debt (which has no income tax) and then pays it off with stocks, where it also avoids being taxed as its never realised.
I think its a harder problem than you give it credit.