There are various fields in which you can go after B.Tech :

1.You can go for gate for masters

2.You can go for MBA

3.You can go for government services

4.You can join varoius online courses which readily provide jobs

To know more about careers option after B.Tech you can follow this link:https://youtu.be/zPS6aBPEVgE

Hope this helps you.ALL THE BEST.