Since you are seeking what to learn, and you are enjoying Haskell, I would say stick with Haskell.
Programming languages are tools. If Haskell can handle the kinds of problems that you are working on, then that's a good tool for the job.
If you discover a programming challenge that Haskell is not the right tool for the job, then that would be a good time to consider alternative languages.
Regardless, Haskell will teach you a lot of good programming habits. And those good habits will be applicable to any other programming language you learn in the future.
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Thank you for you interest.
Since you are seeking what to learn, and you are enjoying Haskell, I would say stick with Haskell.
Programming languages are tools. If Haskell can handle the kinds of problems that you are working on, then that's a good tool for the job.
If you discover a programming challenge that Haskell is not the right tool for the job, then that would be a good time to consider alternative languages.
Regardless, Haskell will teach you a lot of good programming habits. And those good habits will be applicable to any other programming language you learn in the future.