Job vs phd.

I completed my M-Tech from IIT mandi with a cgpa of 9.3. immediately afterwards I got a govt job but a low paying one(50k) and i joined because of stability reasons and my family was so happy. I had offers from top iits for phd but didn't join. However I regret now as there is nothing to learn and i felt like applying again? I applied and I got phd at iitd-abudhabi campus? I would appreciate any suggestions on joining? I am 29 years old.