The struggle is not learning a new language nor becoming fluent. The real expertise is being a front-end expert, authoring efficient architecture around user i

The struggle is not learning a new language nor becoming fluent. The real expertise is being a front-end expert, authoring efficient architecture around user interactions, browsing the MDN without effort, mastering the DOM... Then, being a back-end expert, knowledgeable on scaling, could architectures, security issues, being able to author good API design... If you can be considered an expert in all of this, and also edge computing, I don't think switching language would be an issue for you. Language is a tiny fraction of required expertise and you might be more productive by switching to an appropriate one.