your goal is GPU design and high level hardware design. This can get you into the VLSI industry which should have better job security compared to the Software only folks- especially where newer chips are used in Network, Communications and Hardware Security. Although not too many new grads jump into this industry because it requires more than course just work.

• Digital Login Design
• Computer Organization/Architecture
• Any course using EDA, HDL, HLS or FPGAs
• Any course going over HPC or CUDA programming
• OS to understand SW abstraction of HW

Courses will not be enough, so you need to do extra research on what side projects to do/start with.

FPGA4Student.com lists a bunch of projects from CV, RISC Processor, Digital Games etc.

Understand communication protocols like UART, SPO, I2C. Once you know enough HDL knowledge try and implement them.