After a B Voc, you are qualified for further studies in many areas. You may join for a B.Tech in the related area or acquire higher learning in the form of an MBA that would give you an opportunity to handle managerial functions in industries such as finance or operations.
Specialized courses or certification programs in areas of your interest will help to increase career avenues. Several bridge programs can facilitate vocational graduates joining degree courses from certain universities. Higher education's flexibility of choosing any relevant vocational qualification offers it easy transitions towards further vocational degrees for all such graduates who further want to learn in some degree. That really depends upon what qualification institution provides for their recognition of the B Voc you got and that specialty you look at specializing into.