Want to become a PI. Question about the experiences I have had

Years ago, I identified and leveraged a legal gray area in the medical field and built a company around it to profit from it. Eventually the government stepped in, shut it down, and offered me a cooperation agreement. I took it.

I worked as a confidential informant, helped them understand how the operation functioned, and avoided significant prison time. Multiple 3 letter federal agencies liked my work and continued to use me on separate investigations even after my own matter was resolved. I was compensated.

I liked the work. I'm trying to move into private investigations, but most firms won't touch you without formal experience, and government agencies aren't exactly eager to put anything in writing.

Looking for suggestions on how to break in.

Thank you