As I get older, I realize that learning new stuff all the time is a mugs game. 90% of shiny new things will be irrelevant in a few years. So I'm fairly cautious about what I bother to learn. I'll grudgingly learn new stuff if my work requires it, but mostly I coast on my decision to learn python 15 years ago.
I think that you just realize eventually that you have to be more selective with your attention. And it's often not hard to use up plenty of time keeping up with whatever domain you are already in.