Paraguay is the only country successfully reviving an indigenous South American language

‌Actually, besides Guarani, there are other indigenous South American languages like Quechua and Aymara, but these have essentially disappeared in other South American countries.
They are languages spoken only by a tiny minority of indigenous people,
but in Paraguay, they have revived Guarani on a national level, and it is said that the entire population speaks it fluently.
The country itself has a certain sense of nationalism and possesses a sort of "tough gene" within South America.
Just look at the Triple Alliance War, lol