Learn all the things (that you want to learn).
I suggest people play with new frameworks, new tech, new languages.
Learn them, learn FROM them, make yourself overall better.
But that doesn't mean you have to shift your entire life over to them, refactor everything, and destroy productivity. And balance this with your life of course.
Don't get stuck in analysis paralysis on what to do next. Go with your gut. Learn, adapt, move on. Your cumulative knowledge will grow and you'll be a better developer/engineer/sysadmin/etc.
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