Transcy can give you the best support for selling worldwide. This is third party app featured with currency converter and language translation. Transcy can auto detect the location of your store's visitors to display the suitable currency switcher, this is aimed to create better shopping experience and drive more sales. Especially, Transcy is now available in Shopify App Store with FREE plan, and you can take a free try to set up your store up to 167 languages without being charged.
You can explore Transcy HERE and install the app for free. Hope it can help!