I suppose I was at best a semi-pro - I used CL for my Master's work in the 2008-2012 timeframe. Later on I built a personal monitoring tool for my workstation, a early Prometheus really. Later on I lucked into a Clojure shop.... and was assigned to a Python team. Ha.  These days I mostly do Scala at home and Go, Java, or Python at work.  Lisp is still far ahead of the curve in many ways. Visions of the road not taken...