So, what can we do about it? Realistically and legally?

Unionize. Seek work in union workplaces. Vote for and lobby politicians to strengthen labour rights by passing laws that make it very easy to unionize and very hard to bust unions. Unions increase the share of wealth labour produces that ends up in the workers’ pockets. Unions decrease the political power of the elite by decreasing the money available for them to spend on politicians while increasing the money labour can spend on politicians. Which further limits how much wealth can accumulate at the top.

Adjust the CPI to include housing and asset appreciation. As it is the nominal value of everything is inflated with cheap debt, which devalues wages.