There are many solutions, many ways to limit the magnitude of differences of wealth.
But America is so thoroughly owned by the wealthy that implementing one of these solutions is not desirable. The legislature in America only works on behalf of the ultra wealthy and any legislation that passes will be to increase the magnitude of the wealth gap.
Also there's the aspect of how many Americans view themselves as temporarily inconvenienced millionaires. The average person doesn't want rules like this because they're sure it'll apply to them someday.
But America is so thoroughly owned by the wealthy that implementing one of these solutions is not desirable. The legislature in America only works on behalf of the ultra wealthy and any legislation that passes will be to increase the magnitude of the wealth gap.