Whatever skill you want to learn and will have fun learning. I am trying to learn more about kernel-level programming, because that's something I was always curious about. So that's what I am doing now.
As others as alluded to, long term success requires more than deep technical excellence. Winter break could be a great time to learn about another field, get experience talking to others (volunteering maybe), broaden your horizon of thought with books you may not normally read, or, if your passion truly is technology, work on a higher risk project that will likely fail but you could learn a lot from.
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[ 4.9 ms ] story [ 59.1 ms ] threadFind your passion.
You'll come back to it with renewed enthusiasm and new ideas to try out.
If you're into webdev and want to try something a bit different see Elixr/Phoenix and the Way it can do dynamically updated server-side rendering.