Getting an EE degree is always an option — but since CS isn’t an engineering degree getting a second bachelor’s will take four years part-time.

I’m doing that now at ASU and the total requirement for me is 71 semester credits. Maybe I could have found a program for which I only needed 60ish, but that’s the only program in the country with part-time remote classes that will cover what I need (antennas and RF). Someone who is interested in digital design will have more options. (And I haven’t really looked at other countries so YMMV considerably outside the US.)