It's a great language that gently introduces aspects of lower level languages and it's used a lot for AWS lambdas. It's also getting a lot of popularity and jobs using it are (in the UK at least) very well compensated.
Beyond that, I'd say C# python, Java.
Edit: if you don't know Typescript, learn that first.
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I would definitely recommend Go.
It's a great language that gently introduces aspects of lower level languages and it's used a lot for AWS lambdas. It's also getting a lot of popularity and jobs using it are (in the UK at least) very well compensated.
Beyond that, I'd say C# python, Java.
Edit: if you don't know Typescript, learn that first.