How do we realistically fix Brazil?

Hard to say desu, reducing the bureaucracy and toning down the abusive interests rates banks currently impose so small firms can actually finance themselves and compete in the market would be good. A good, balanced economy is generally a start. Also, competitive firms require educated people, or else we will be an eternal low value commodity exporter, so we could use a better focus on the educational system, not just better investment, but most likely rework on the system.

They should nationalize every company-mine owned by americans, kill every polititian/enterpreneur that has business/corruption with them

Realistically? Large scale government relocations. They gotta move farmers into the Cerrado, they have to tear down favelas and build public housing. The quality of education must increase and they have to force kids to go. Create military police and a powerful intelligence agency.

Fucking this

Nuke it from orbit