I have no real career prospects (it feels like just a job now). I'm burnt out and have basically zero marketable skills. Even out of college, I had to apply to about 250 positions. I have a masters from a better school now and it doesn't feel like it made any difference.
"I recommend broadening experience beyond the pure computer science to domains that leverage computers to build new things: medical devices, signal processing, sensors, computational biotech, satellites, audio; whatever looks fun."
I love learning about this stuff. I really love the synergistic aspect of doing what you describe. But at the end of the day, it means nothing. Who cares if you built simple apps, have a personal website, worked on personal audio processing projects, or built some homebrew IoT type stuff? Certainly hasn't meant shit for my career. They want people who have done this in an enterprise setting.