tex_sharpe

Check south of Brazil (Santa Catarina and Rio Grande do Sul states) Many cities have Germany roots from immigrants and you can handle, at the beginning, only using German/English. They are very safe too (for Brazilian and Latam standards).

Check the city of Pomerode: https://en.wikipedia.org/wiki/Pomerode

That checks everything you want: cheap land/houses, low taxes, mild winters and hot summers. Amazing beaches at 1h driving. Small city where you can connect with people in the neighbourhood.

Negative: very far from Germany. It will take you 1 day to travel (1h flying to São Paulo + 12hs to Europe, plus the waiting time and going to the airport)