I'd create workshops with specific outcomes in mind (pre-recorded), like one for writers who have never written for comics before that I'd sell between $50-150.
I would recommend charging a small amount though. Otherwise you will have attendance issues, but even $10 can make people commit to coming.
can you raise the prices? do you have a captive market?
are there other businesses that can benefit from the workflow you have setup? I don't know about intricacies about selling professional services, but can it be applied to selling anything else? Do you have a unique proposition that is transferrable to other niches?
what about acquiring a competitor? $15k might not be enough for that, but you can use stock or leverage
Vladimir
https://humaninterfaces.co