Hello
Hope you are doing well

If you have enough experience now in BPO so you must be having some foreign clients. You can talk to them and ask for jobs in their companies.
Also you can search about the country where you want to go and companies which hire BPO's.
After that you can get knowledge about their salaries, facilities etc.
I think more is the experience, the better job you can get.

Further you can get more information on this topic by going through the link below:
https://www.careers360.com/articles/bpo-jobs-how-get-hired

Hope this helps you
All the best