I think that the most effective method of promotion will be advertising on thematic forums. Or simply output the platform to the top on requests in the browser
It is very expensive. Just imagine how much you need to spend on getting to the top in all the major world languages.
To begin with, enough English
Chinese is also needed. And then, local languages are very necessary. I do not think that in Asian countries, where prostitutes are many, everyone knows English.
Yes, take at least Thailand. The minimum number of English speakers there