Your capabilities to serve depend 1) different countries' legal systems, 2) how your clients contracted, and 3) debt recovery team in the specific country.

I am being credit controller 20 years back, managing over $100 million debts across Asia. Base on my experience, if I want to engage you, you need to give me confidence that you know how to deal with the specific country legal system well and good understanding of contract law to review my contracts, and finally, do you really have a team in that specific country to recover debt for me.

Therefore, forget all SEO, AdWordsm, etc ... if I am in the position to advise, I will review your business and marketing strategy and conduct a product-market match before advise what marketing contents to be developed. From here, an approach marketing campaign with multipile waves of reaching out and follow up to generate quality leads and close more customers. (some of my clients had generated more than 500% customers in 3 months.