Can I suggest you find languages that solve problems you are facing?

Go is great if you do a lot of scripting or web dev. But wouldn't be so good if you're making chatbots.

A chatbot or real-time message passing would be great to use Elixir for.

Rust is great for WebAssembly or desktop programming as a replacement for C/C++.

Swift and Kotlin are the obvious choices for mobile development. Are your customers asking for mobile apps? Do you want to build mobile apps? These would be obvious choices.

Chase the problem you're trying to solve and use the right tool for the right job rather than trying to learn a language just for the sake of learning it. I find trying to learn a language I won't use to be something that quickly drops off my radar.