I have completed my MBA & have a year of experience in marketing. Can you suggest some in-depth courses that I can do?

Christus, You should start your professional career now. Get a job and gain practical knowledge of your field.

Marketing is a vast subject. You first need to decide what in marketing interests you & then pursue a course in it. Some areas of specialisation are social media /digital marketing, branding, product marketing, corporate communication, retail, e-Commerce, analytics, market research, rural marketing,