If you're using Clojure and are happy with it, I'm not sure if Kotlin has enough to entice you. I haven't seriously used Clojure myself, but from what I know about it, I think that Clojure and Kotlin are expressive in very different ways. Kotlin is built as a modern statically-typed programming language, trying to make the type system both more powerful (through the addition of nullability) and less costly (through the support of type inference, smart casts AKA flow typing, concise class declarations, etc). Clojure, on the other hand, is much more dynamic - it supports the minimum amount of static typing support required by the JVM environment, but it prefers to use hash tables instead of explicitly declared types, and it also allows the code itself to be dynamic through the use of macros.
Of course, Kotlin's approach allows for much smoother integration into the Java ecosystem - e.g. I haven't heard of any significant number of people using Clojure to develop Android apps, while for Kotlin the migration from Java in the Android context is very straightforward, and appeals to many developers. But if you're happy with the libraries that exist in the Clojure ecosystem, then again this might not be relevant.