it was 13 years after Paul Graham annonced working on a new dialect of Lisp named "Arc", and it is not a completed language yet now, I am using clojure and not satisfied with it. I don't know whether I can consider Arc lang.
Asking whether Arc is alive, or completed, tends to bring up arguments over definitions.
Perhaps if you talk about what you want to do with Arc, we can discuss whether it's a good fit or not. Why are you not satisfied with Clojure? What do you like about it that you want to keep?