Even Shopify merchants who sell predominantly in their home country are often surprised when they check where their visitors (and customers) originate.
The concept of a “world marketplace” is alive and well. Customers can come from practically any corner of the globe to arrive at your store.
That means you need to be ready to speak their language. Many will be able to speak the primary language used in your store but it’s important to ask whether you could be selling more if you spoke their first language?