Whether to do a Masters or not? If Yes, then in which major?

I have a bachelor's degree with majors in Marketing and International Business. I have been employed for almost 2 years now and currently employed as a Senior Executive in one of the top-notch Advertising Agencies in Bangladesh. Since I already have a BBA from a top-ranked university in Bangladesh, a MBA is hardly an addition for me, however, I would like to enrich my knowledge in complimentary fields or something absolutely new. In my country, a Masters, unless from abroad doesn't make much sense, which makes me confused about what to do...would be great if I could get some good insights from you :)