I have completed B.Tech and M.Sc math. What should I do for a bright future?

Your qualifications are good. You can get job in both Technical field (engineering stream) and Teaching field and pharmaceutical also. Identify your interest and go & achieve.

As you have completed M.Sc, Maths you can apply as Maths lecturer, you can start you own coaching classes for Maths. If you are interested in government jobs, you can apply for governmental exams.