See, if you want to continue your journey in the field of Mechanical Engineering, then I would suggest you to take an attempt at the GATE examination. GATE will open many doors for you and you can also do your masters from a reputed IIT or NIT which will boost you career exponentially.

If you want to remain in the non-core sector, then I would suggest you to fill the paper for bank PO, as this job will not require much of your past experience and the exam is also aptitude based. All the best!