yes, I did Common Lisp consulting for a decade, it was lucrative. the mistake is to go searching for office jobs (though they also exist). if you want to jump start a consultancy down size your life as much as you can and then go looking for projects. it's fairly easy to find a no questions asked (as far as stack) 30-40k project, where a single developer lisp will be a massive advantage. but the last one I did was closer to 700k, took two of us about 8 months, fintech.