You should adapt to the place that you live. You cannot use your old currency at a new country. You cannot use your old language at a new country. This means you have to adapt to your new society and join it. This will allow you to become productive to your new country.
When entering a new country one needs to be aware and adopt the civil customs of the current occupants of the country without relinquishing our own. Many countries have customs that might even be advantageous to adopt in other cultures. By learning and adoption the cultures of a country we enter or visit we have the opportunity to enrich our own culture as well as theirs.