What should I pursue after MSc economics - MBA finance or MBA business analytics or MSc data science to boost my economics background?

This would depend on your interest areas and career aspirations. In case you intend to pursue a career in Economic/Equity research / financial journalism/academics area then M.Sc Economics is better. However, if you want to move into a career in analytics & data sciences, then the other two courses

There are more career opportunities in Data Science and Business analytics. Since you have already done your Master Degree, why not you go for the course provided by Great Lakes - the flagship (BABI) BUSINESS ANALYTICS AND BUSINESS INTELLIGENCE course. That will fetch you good job opportunities.