Just to give a counter-example: I am coming from a Ruby context and still love Crystal. But to a certain degree you are probably right - I at least remember a time where I wouldn’t have traded the benefits of a static type system over the flexibility you have in Ruby. Just wanted to bring up my case as an example that it is certainly possible! Maybe we can find some concrete arguments to make Crystal appealing to Ruby developers specifically?
Thinking further about it - I found out about Crystal via the Ruby Weekly newsletter featuring some blog post as an excursion. My impression today is that there isn’t much content around that could be presented in places like that in the first place. So maybe the slow growth issue of this community would solve itself if we all started writing/blogging about it more. It’s certainly been on my todo-list for years now, but actually sticking to it is a different story…