If you've never done a lisp, then go for Clojure for sure. It's refreshingly fun and different, plus you can read my totally helpful post to get started
I second that, it's radically different from most languages so if you're not familiar with LISP-y languages already then it could enlightening to work through the "wizard book".
Structures and Interpretation of Computer Programming:
Oh the SICP book, brings back memories of reading Paul Graham's essays on Lisp and Arc
Ah ah thanks I read it, and it helped. I studied Common Lisp a bit many years ago (using SBCL) but I don't remember much.
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