You need to find an industry that needs something built. Then learn that field.

I too hire and fire engineers. Part of the hiring interview...
How are you in chemistry?
How are you in process flows?
What about thermo dynamics?
Long silence....
Well, when we have something completely designed and need someone who can solder we will call you.

Point is, just because you spent four years getting a piece of paper stating that you know OHM's law really does not mean much, if that is all you have.

One of the funnest clients I have builds automated punch presses. If I did not have some knowledge of hydraulics I would not be of much use when it comes to designing the control systems for the machines.