I am a C/C++ developer. All my work is in these two languages. But to increase my runway of employability, I have finally decided to learn following additional languages:<p>Rust, Swift, Kotlin and Python.<p>Anything else I should consider?
I went from C/C++ to Go many years ago and never looked back. It's a language designed in the service of software engineering. Many of today's most prolific tools are written in Go. You're much more likely to come across Go than the others, besides Python.
Just curious, any specific reason you didn't include JavaScript? More user-space apps than ever has been / is being ported to the browser, e.g. Photoshop. I'd say for maximizing employability learning JS is a pretty solid bet.