Comment by thesz

  > When you know half a dozen programming languages or web frameworks, the next one takes you a couple hours to get comfortable with.

Learn yourself relational algebra. It invariantly will lead you to optimization problems and these will also invariantly lead you to equality saturation that is most effectively implemented with... generalized join from relational algebra!

Also, relational algebra implements content-addressable storage (CAS), which is essential for data flow computing paradigm. Thus, you will have a window into CPU design.

At 54 (36 years of professional experience) I find these rondos fascinating.