Submarket help for a sustainable fashion business consultant.

I am a sustainable fashion business consultant/designer/circular strategist (although I could use some help with that title also) and I’m trying to clarify my submarkets and niche. Right now my niche is designer brands, dabbling in and/or interested in sustainability, privately owned, who want to take their business to the next level sustainably. These clients I would have to pitch/advertise to in some way. I also want to be open to start ups, I think and those clients come via word of mouth.