Good question Kamal. If your job profile requires reaching out to audience, which can be targeted through digital media including social media (e.g. Facebook, LinkedIn), there's a huge opportunity for you to accelerate your career growth by acquiring digital marketing skills.
On the other hand, surely freelancing and realizing your entrepreneurial dreams could be other reasons for you to master digital marketing. You should check this article I wrote earlier about the opportunity of learning digital marketing for various profiles and objectives:
Btw, did you join our Digital Marketing for Career & Business Growth orientation session live? You can do so by signing up at http://www.digitalvidya.com/dmo
Hope this helps. All the best!