Possible wrongful termination case?

Hello, thank you for your time reading this very long sequence of events. I am a board certified Nurse Practitioner. was let go from my position back in September. I was told, over the phone, that my FULL TIME posn was being eliminated d/t impact of COVID on the practice, the excuse was that there were not enough patients to keep me on the payroll. Timeline: Practice owner (surgeon) owns 2 clinics in Wisconsin (Kenosha, Oak Creek). Early-Mid 2020 practice owner strikes a deal to open a new practice in Illinois, starts looking at real estate. He shuts down clinic during April/May d/t COVID, I'm furloughed. He applies for and gets the payroll protection program loan. Reopens clinic late May yet I'm brought back not back to FULL TIME. Four wks prior to my being 'let go', the practice owner hired a physician's assistant, supposedly to work in the new clinic. Owner & his manager call me on 3-way to tell me my position is eliminated. No options given to stay on insurance, no severage package, all I get is my unused sick and vacation pay. No documents sent for me to sign, only thing I ever signed during employment was a non-compete. I have learned he struck a deal with another physician, purchased real estate in Illinois for new clinics, hired back a former nurse practitioner who left at the start of 2020, and the clinic in Illinois is not even been started yet d/t remodeling. My annual review was fine. There is no documentation of disciplinary actions or anything of that nature (to the best of my knowledge, and I have never signed anything of that nature). Is there any traction here for a wrongful termination case?