There is a hell of a lot more difference between the various programming languages than their syntax. Natural languages as well - you can render idiomatic English in any language, and if you don't care very much about getting your intended meaning across (and your listeners are both patient and fond of puzzles), you may well choose to do so. It may get you food and lodgings for the night. But the computing equivalent of getting by in a pidgin isn't quite the same thing as programming in the language you're using.
Syntax is a very minor piece of the programming language pie. If Python, Haskell, and Rust all shared the same syntax an expert Python programmer would still have a hell of a time getting anything done in either of the other two languages.
Face it, we all pretty much use the same 10 or so languages in industry.
My situation is this - people see my CV, see those languages, and immediately dismiss me for Java jobs. I think it's a short sighted decision, but it's the thinking that permeates the industry.
This are how you make objects, this are how you make functions, here's constants, here's variables. Use let instead of var for the scoping you're familiar with. Here's a standard library, it's a bit spartan but pretty much everything is familiar.
Later on I stopped using 'class' and 'this' and just used closures that return objects (I consider it more idiomatic, YMMV). I got a good feeling for when to use an object and when to use a Map.
I found out the fun way this trait often doesn't fly in interviews when they ask about your best quality.. Scuttled a phone interview with a hiring manager at Cloudflare real fast and he condescendingly chortled that "Everyone says that". Thought I did an okay job rescuing the interview after that but.. Wasn't feeling the dude anyway after that so I guess the feeling was mutual :)
My retention is a bit better too, even if I don't see that new thing again for a long time, but not nearly what I wish it was... At least now I'll remember having seen it and a general sense of the concept even if I have to re look up the specifics.
CSS is a great example. Do I know everything about it, even after 10 years? Nope. But I know it well enough that a quick reference is all I need for any problem.
Programming in general, too. Took me a minute to grok fundamental things (data types, functions, etc). I don't care what language I use, it's all one, plus syntax. I want to use other languages, for fun and synthesis.