Why does changing from one language to another make a programmer fresher? [closed]

Question

Right now I have been working on language X for the last 2 years. I am very good at it, but language X is not popular so jobs are not readily available for it. Consequently, I am thinking to change from language X to language Y. But that means I'll be a fresher again. Is making the change worth it? Even if it means losing all the experience I have in the other language?