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You may want to consider getting a certification to teach English as a second language.
Other things would be business and sales, international law, technology.
There are so many! You can be a tour guide, an English teacher in another country, a travel agent, an employee of an international business, a traveling salesman/woman, a political delegate, a travel writer, a travel blogger, a researcher, etc. There are a lot of options for you, it depends on what else interests you :)