I agree with Perry, about the passion. I always find something interesting to do or at least to read about.
As for JS, I've avoided it until now (59 y/o and counting... being a programmer since I was 20).
The approach I took with JS is to use it as a compilation target and focus on Typescript instead. I read so many praises about the language, so I started learning it. It's amazing.
A few more points on JS:
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