Cosmopolitan

Some people manage to adapt to the aspects of the host culture they see as positive, while keeping some of their own and creating their unique blend. They have no major problems returning home or relocating elsewhere. This group can be thought to be somewhat cosmopolitan. Approximately 30% of expats belong to this group.
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https://en.wikipedia.org/wiki/Culture_shock#Reverse_culture_shock

to understand the word Cosmopolitan better here is a more illustrious version of the definition.. cosmopolitan.