Somebody is underrating the Common Lisp ecosystem, me thinks. There are much fewer libs than in Python, of course, but, most likely, everything you need you would find in CL, and some of those libs are very high quality.

>There is one legitimate reason to switch from Lisp to Python: The number of packages and extensions. Python really has more than just batteries included

Which you can "steal" by using them from Common Lisp. By using the lisp library called "burgled-batteries".

But still, as pointed below, the Java ecosystem is even bigger, and you can easily leverage by running Common Lisp on the JVM (using Armed Bear Common Lisp).

And then there is Clojure, a lisp-like language that is weaved together with the JVM and thus with very easy ways to interoperate with the JVM.