It's sad that this is what continuous learning for software engineers has come to mean. Don't do that! Learn to express different and deeper ideas in the technologies you already know. Programming is a huge world. Maybe you have truly tapped out line-of-business CRUD apps, but remember every line in the CS course catalog is a whole universe unto itself.
Operating systems, distributed systems, databases, graphics, embedded systems, HPC, etc. Pick a layer of the stack, understand it, and move it forward a little.
You'll notice that many of these worlds have completely skipped the Javascript framework treadmill, and K&R C from the 1970s will get you a decent part of the way there.
I mourn the time I have to spend re-learning CRUD because it distracts from this mission.