[jodrellblank]

why don't CS degrees teach you much technical skills?

Because its a good CS school. CS is about the mathematics of computation, not about the computers. Technology is an implementation detail. ;) (It's an ivory tower academic course, not a course intended to help people start businesses).

You can find Dijkstra's notes online and they're all handwritten, for example.

How can I change this

Study and practice whatever it is you specifically want to get better at, I guess, be that database administration or dealing with small business taxes, taking payments or whatever.