I mostly agree, but I'd add an important caveat to (2): Before you go looking for a new job because you're not being challenged, ask to work on other projects a

I mostly agree, but I'd add an important caveat to (2): Before you go looking for a new job because you're not being challenged, ask to work on other projects at your current job. I've found this is a much better way to learn new languages/stacks/architectures/patterns since you already have a lot of the relevant tribal and contextual knowledge.