I've found, as a Lisper, that the secret to being effective and valuable to a company such that you're both irreplaceable and not too much of a drag on the rest of the organization is to pick secret weapons that have slightly more overlap with the normal world than Lisp.

Clojure, Nim, Elixir, and more faintly flirt with the true unbridled power of a CL environment, but primarily provide useful abstractions and some familiarity, compatibility, and/or killer features that can't be turned down as easily as a true CL environment. It works out, when the company is small enough that you're driving your own project. Just be sure do document what you did.