What should I do after M.Sc. in chemistry?

Apply for fellowship or junior researcher in whatever field you want. Also, there are frequent vacancies in government sectors keep an eye for such notices and apply in them. CSIR and DRDO, etc. , give out vacancies each year and so do other institutes. Also, pursue Ph.D.

You should apply for a job and also do Ph.D. in a non-technical field and research on new technologies related to chemistry.