Hii Vikas!
In oder to get good placements after b.com, you ought to go for certain professional courses. These may be short term or long term courses. There are many short term courses for b.com graduates to pursue such as - Digital marketing offered by IIDE, Mumbai ; accounting and taxation, GST , FRM/ CFA/ CMA/ CPA etc., Basically Marketing and Finance courses will help you progress. You also need to learn MS EXCEL, Tally and the similar courses. Hope this helps.
Good luck!