Any time I make the effort to learn more or brush up on CS fundamentals I end up forgetting most of it in short order because I so rarely use any of it at work.

Any time I make the effort to learn more or brush up on CS fundamentals I end up forgetting most of it in short order because I so rarely use any of it at work. Ditto mathematics past roughly Algebra 1. Every now and then I try to brush up on calculus or linear algebra or something, but it takes so much time to keep those skills up when you're not using them at work. Like keeping up foreign language skills while living somewhere you rarely encounter native speakers.