You can go for many courses. Below are the some courses you can choose according to your interest

Certificate course in CCNA

Certificate course in Embedded system

Certificate course in VLSI systems

Certificate course in Robotics and Intelligent Systems

Certificate course in Power Electronics

Certificate course in Signal processing

Certificate course in Hardware Networking

Certificate courses in Verilog and VHDL

Certificate course in Aircraft Maintenance Engineering-Electrical System

Certificate course in Real Time Operating Systems (RTOS)

Certificate course in DC and AC motors

Certificate course in in Mechatronics

Certificate course in in PLC

Certificate course in SCADA

All the Best!!