Ask HN: Dealing with a coding brick wall. Go deep? Learn something new?

I'm looking to hear from more experienced developers who have overcome being stuck in their programming career. How did you do it?

Is it better to go deeper into a language (in my case PHP) or learn something new (I'm thinking Swift or Java maybe even Go). On one hand learning a new language makes sense, but on the other hand, I'd like obtain deeper knowledge of PHP. My goal is to be a better developer, so both are probably best to do, but I am wondering about specific things to do to become unstuck...