B.Com

Hello,
Thanks for asking.
There are various options are available for B.Com graduates.
If you want to go for further studies, then pursue M.Com or MBA.
But if you want to get a job, then you can also prepare for government job exams like SSC CGL, UPSC exams, banking exams, etc.
Government job preparation is really good option for secure job & future.
You can prepare & appear in more than one exam at the same time.
Check :
Bank exam preparation : https://www.eduncle.com/ibps-rrb-recruitment-exam
UPSC exam preparation : http://mrunal.org/upsc
Best of luck.

Instead of certification, please do an internship in the related area where you want to make your career and participate in the organizing committee of your college festivals in the coordination, event management, budgeting, etc as it will add more value.

You may pursue any classroom-based or online certification course related to a particular stream of Marketing like Digital, Email, Social Media, AdWords, Search Engine Optimization, etc based upon your liking. Digital and Social Media Marketing are some of the current trending things in the field of Marketing. I have no idea about the classroom-based courses, but you can visit platforms like Udemy, edX, Coursera, etc. for pursuing any online course(s) related to your area of interest. I hope it helps!

If you are a working professional, MBA will help to perform your work in well organized and planned manner, plus it can be helpful in getting you promotion.
MBA is not only about business, but it helps you in overall development of once personality and ability.

If you are looking for higher education you can look for MBA in finance. You can target for colleges like XLRI, NIBM, IFMR, MDI, S P Jain, NMIMS apart from IIMs. After MBA in finance you have opportunities in investment banking, portfolio management, risk analyst, etc.