The American market is currently the largest market for Amazon book sales, but it is not the fastest growing. Other markets, such as that of India, are also rapidly growing which has created more interest in translating books into languages other than English. There are essentially two ways that one can get a book translated into another language. One way is to go to a translation company which will have a team of translators translate the book for you. Translation companies usually support a limited number of languages and can be expensive, but they are reliable.
Another way is to hire a freelance translator. This can be done through online platforms such as Upwork and Fiverr. Freelance writers will usually charge less and if you find a good one, it can result in a long-term relationship where you have a reliable way to get your books translated into a certain number of languages. There are drawbacks since it can be difficult to find the freelancer whose skills and experience fit with what you need for your translation.