I have completed my MSc with chemistry so now I can't figure out which course to choose.?

Having done your MSc in Chemistry you would be well equiped with the filed of study. If you want to pursue higher education and broaden your current skillset and knowledge you can pursue a PhD in Chemistry.

Some other options would include doing an MS or an MBA. Let me explain.

If you wish to explore some new subjects and learn more, you can go ahead with an MS in any specialization and if you wish to acquire the management and administration side of the industry then you can opt for an MBA.
I know choosing the right course can be a little difficult but if you align your profile with your preferences and your future goals, the shortlisting process would be a lot easier.