First time I hear about FOMO but I can totally relate!
Thanks!
What!? You missed out on the last full decade of FoMO? :D
That said, there is value in learning a strongly typed language. If you like it you might want to introduce concepts in your Go work, if you really like it you will probably want to switch to one, and if not, that's also completely okay, and you'll know what you don't like about it.
For example I like Rust, Scala, TS, but Haskell always makes me cry a bit. Spent many years using Python (py2 to py3 migration was fun), but a few years ago I realized that it's a bad trade off for almost anything I work on, and makes me rage a bit every time I run into super dumb errors, so I avoid that too :)
I know enough Rust to make myself usable coding in it, however it is mostly for hobby coding.
On my line of work there are zero reasons to move away .NET/JVM/JS stacks, unless driven by customer requirements.
What you're describing is FOMO, Fear Of Missing Out.
One of the things in the IT fashion industry is to learn what to invest right now, what to ignore, and what to keep an eye on for later times.