Every Amazon marketplace has nuances in terms of international seller requirements. Broadly speaking, here are the extra things to consider before expanding;
Product and category restrictions. Just because you can sell products on one Amazon marketplace doesn’t mean you’ll be able to sell the same product on another marketplace. Sometimes Amazon requires documentation (such as government approvals for grocery items) before you’re approved to sell within certain categories.
Taxes and import duties. Each country has different taxation rules in respect to Amazon revenue, such as VAT in Europe and GST in Australia. Where your inventory is stored may impact your tax obligations.
Local language translation. This relates both to the product information on your detail pages and ongoing customer support. The Amazon Global Selling program has been designed to help with product listing translations, but it doesn’t always work perfectly.
Maintain performance levels. Failure to comply with Amazon standards may result in account suspension. You can set your own policy in respect to shipping speed and returns, to ensure you are held to standards that you can meet.