Being a Relationship Manager and selling insurance and other similar products does not mean you are in banking sector.
You have not mentioned your education details like your graduation or post graduation. These details are also required to properly guide you and show you the future career path.
There are many graduates and post graduates doing sales of insurance and other banking products as Relationship Manager and yes, people who have sales and marketing as their passion can only survive and progress in this profile. It appears that you are not made up for this an
Now since you are an MBA, you will be offered jobs based on your MBA qualification only and not on your engineering degree. If you are working and have done MBA while working, then it would help you in the engineering field and not other wise.
Best career is what you make and therefore there is no defined best career any where. If it was there, all would have been Ambanis and Tatas.
Please try understanding what you are good at and what are your competencies, strengths, weaknesses, etc. Based on these factors you should decide your best career. You should be best for a career an
Your educational credentials are very good and your experience also is in line. Why do you wish to quit from a PSU? I would suggest that you can think for switching to another PSU. If the reason is strong enough, then only I would suggest you to move out, since once out, you will not be able to get back in. Therefore I suggest you to think one last time and the move should not be out of frustration or a bad boss.
I am happy that you are keen on skill upgrade.
A Diploma in SCM would be ideal and further to top it, a course in SAP SCM. This will help you to move to the privat