The reason that the billionaire tax failed is that it’s stupid. Taxing unrealized gain is wrong in most voters minds. There is a much much better solution.
All billionaires hold their wealth in stock, which until they sell it is an unrealized gain - meaning that money is not being actively used by the owner monetarily. Their superpower is leveraging against those stocks to get a loan to buy the $500 M yacht (looking at you Bezos). Currently that is tax free. I will argue to my grave that getting a loan against stock held is now a realized gain and should be taxed as such.
TL/DR; if you tell the voters billionaires should be taxed when they get a loan against their stocks to buy a mansion, yacht or election they would vote for this in a heartbeat.