You are presently engaged in a back office job which means you are basically in the area of record keeping or support administration or clearances or settlements etc. This does not give you an experience to switch to banking, insurance or risk management jobs. In such a situation I will suggest you to do some certificate course in these areas and after that you can either apply in private banks or insurance companies. As you are already holding a MBA in banking I can suggest you some courses in insurance and risk management arena which you can pursue to make your career in this line and get a suitable job -
1. Certified Risk Manager Certification (CRM) course - It is conducted by the National Alliance for Insurance Education and Research. Generally the programme consists of Principles of Risk Management, Control of Risk, Financing of Risk, Analysis of Risk and Practice of Risk Management.
2. Certificate in Insurance Services - This is a programme which gives detailed aspects about the insurance sector and its applicability in various industries and the insurance products covering the sectors like healthcare, household, motor, commercial enterprises etc.
Alternatively you can prepare for the most coveted banking service exam IBPS for which you have to check your upper age eligibility (should be not more than 30 years) and then try to get a place in the PSU banking sector. Remember, the exam for IBPS is held in two stages prelim and mains and questions are on reasoning, aptitude, general english and basic finance and accounting mathematics etc. So you have to take help of guidebooks and old question papers to align your preparation accordingly.
Knowledge is power.