Copyright Infringement: Gender Pay Gap — am I screwed?

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. This is not legal advice. Laws vary by jurisdiction. Consult a qualified attorney for advice specific to your situation.
Hypothetical question

Sorry for the wall of text. Has anyone dealt with something like this? I'm not sure what my options are.

client reselling my photography. I've been dealing with this for about 7 months now and the situation isn't improving.

This involves original creative work over the past 18 months. I do have documentation proving my ownership and timeline.

What are my legal options here? Is it worth pursuing?