Is it worth learning any language other than English?

Anonymous
Hi,

I've been trying to be fluent at English, and I have not studied any other language till now. I decided to learn Russian, and actually I already started. However, one of my friends told me that I should have learnt something useful rather than Russian. I'm a bit confused honestly. Have I been putting effort in something that is not worth it? Should I master English instead of trying to learn other things? Could you guide me through this issue?
Is it worth learning any language other than English?
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