We need to impose term limits, fix education, reschedule drugs like pot, and pass some amendments to the constitution. Change the supreme Court so the people can recall them by popular vote for things like treason and knowing conflict of interest that they act on. And the electoral college needs an overhaul. Every state should follow the same criteria for choosing electoral voters and they should do ranked voting in addition. We also need to have federal anti-gerrymandering laws etc.
And for God's sakes we need to look into and reform how many senators and congressmen states get because that's just broken as hell.
We don't necessarily need billionaires. It would help, but there are enough Democrats/liberals that we could lobby ourselves. But nobody ever wants to join a lobby and nobody is pushing it. If large companies can lobby, so can we if we band together.