Stack up on books and tinker-able hardware (if that's you poison). Take time to study the basics of computer science. Tech changes a lot, but the basics of mat

Stack up on books and tinker-able hardware (if that's you poison). Take time to study the basics of computer science. Tech changes a lot, but the basics of math and CS don't. Linear Algebra shows up a lot in graphics and machine learning, study algorithms, even funky weird ones, implement them anew. Learn discrete math, and numeric methods, differential equations and calculus in general. Brush up on statistics. Download papers now, keep a backlog of them on some area you like. Heck, there's so much to learn that a few lifetimes are not enough, and the beauty of foundational knowledge is that it's technology agnostic.