I think that one very important issue got left out: always be learning. The colleagues that ended up having to change careers were ones who refused to keep current with technology. Or who treated education like a vaccine: "get it" once and never again. "Learning how to learn" is probably the most important skill one learns in college, yet it is treated as a side issue (if at all). So many tech stacks have ended up on the "dustheap of history", yet we have to constantly learn new ones.