If you're serious about learning a Lisp but motivated more by, as you say, "having more fun" rather than, say, landing a six-figure job writing it professionally... then may I recommend Janet[0] for your consideration. Janet is an embeddably-small, yet surprisingly batteries-included Lisp implemented in pure C. In terms of syntax and core library it borrows more directly from Clojure than from Scheme, but all the modern Lisps have their bits of influence. I've found both the language and the tiny little community that exists around it delightful.
As an example of the latter, somebody smart wrote a real actual book[1] about Janet recently that was on the HN front page for a day or so when he first released it. It's a gentle introduction not just to Janet but to Lisp in general, and assumes only general proficiency with JavaScript to get you up to speed. I recommend it.