Always makes me laugh when I read things like "2018 is still a long time ago" (no offense or downvote). But also the very thing that perl fought against. Your programming is not going to break for a long time (much longer than 6 years) because there is no reason for language features to change that quickly - certainly compsci theory does not change anywhere that fast.

It takes time to build very large projects like a large, layered programming language, and it should be normal to take many years to learn all the features of something like perl or raku. Because there should be no reason to do it all at once rather than be productive in the meantime.

So anyway, 6 years should not be much in the career of a programming language.