Tell me you've never hated your programming language. Tell me it doesn't have any features you wouldn't be caught dead actually using. Tell me there's a programming language so dear to you that you not only enjoy writing it in the moment but enjoy reading what you've written in the somewhat distant past. Tell me—and this is key—that you not only enjoy reading what you've written, but what others have written.
Experienced developers often say that the best way to pick your next language to learn is to pick a project you want to ship and pick the best language for the job. This isn't wrong, but beginning developers often respond that the only "project" they have in mind for now is to learn more about programming generally and become a better developer overall. If this is your goal (and it's a good one!), then the "best way" to pick your next programming language just isn't applicable. But I think you'll appreciate the second best way.
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