Since you already have a PGDM (Post Graduate Diploma in Management) in marketing, and have a long 8 years of experience, you may be earning a good amount of salary. But as you said, your interest lies in Finance, it is better to choose what you feel good. It is always better late than never! Yes you should do an MBA or an executive MBA, but just try to do it from a good college as doing MBA from a bad college is nothing but a wastage of money.
Hope you live your life doing what you love the most!
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