What cultural faux pas should I try to avoid making in Paraguay?

"It is important to be mindful of cultural differences when visiting Paraguay. It is considered rude to show up late to social gatherings, so it is important to arrive on time. It is also important to dress modestly, as Paraguay is a conservative country. It is also important to be respectful of the local language, Guarani, and to avoid speaking English or any other language in public. Additionally, it is important to be aware of the local customs and to avoid making any comments that could be seen as offensive or disrespectful," said another expat in Paraguay.