There are many options available after completing B.Sc, You can opt it depends on your interest. If you wish to enter into the corporate world then you can go for MBA/ PGDM programme in your desired specialization.

If you are interested in Research or Lectureship then you can prefer after completing your postgraduation programme you can go for UGC NET, You can apply as Assistant professor at universities.

There are many certificate or Diploma programme, you can go as per your desired field, Please explain about your field of interest, then I can help you better.

Good Luck!