Distributors / Group seller for multiple brands?

Hello,

I’ve been appealing Amazon seller deactivation for a several months and already have up.. We have a pretty harmless product – wall stickers and posters – we make our own design, make sure product is good, our own packaging. We have LLC set up, warehouse. Legally it all seems to be good but Amazon though we violated their policy so I assume there is a reason. Even lawyer couldn’t help.

So the question I have: is there any distributors or group sellers that represent multiple brands so we have a way to add our product on Amazon? Not looking some illegal ways but I know that art is sold in Amazon this way but cannot find any information for other products.

TIA!