The real issue is that those in power don't actually want to lift up those that are struggling. I'm not saying there aren't some good politicians--I'm saying politicians don't have the power.
When the government isn't acting on behalf of the people, more taxes would only serve to harm.
Even under MMT you need some sort of taxes to take back money, otherwise the money you print turns into inflation.
And in my opinion (not verified or anything) we're seeing such strong Cantillon effects that inflation is being regulated via soaring asset prices.
So it's harder to buy a house and or a share of SPY, but everyday goods are inflating way below the increase in dollar supply atm.
Edit: Lol, except lumber.
You can certainly do that under MMT, but then that would be the equivalent of not having taxes at all.