Hello Ishant,My advice for you to first identify what you need the most now,if it is a job then start to applying for jobs in various mechanical companies like Tata,Pinnacle and many other.If you are not selected don't be depressed try to find out the mistakes that you are making,it can be your CV or it can be your personality,try to understand and mould yourself according to your requirement.

Now,if you are determined for higher studies,then create a proper routine,follow according to that,to crack GATE and UPSC you need to practice a lot a lot,so be determined and try to execute daily plans,set goals and achieve it daily.

Now higher studies,M tech in mechanical in good option provided from where you are doing,if it is IIT or NIT then go for it,else it has no such help in getting jobs,moreover it creates some difficulty in getting jobs.

You can apply for Govt jobs also they are available,if you want then only.

First try to understand and idenrify your interest or need,then plan accordingly.

Hope this helped

All the best,have the coincidence in you!!