Sounds like you need to move to Miami. Find a crumby storefront or even a storage unit. Get your uncle loading shipping containers in Berlin with product and get it shipped to Miami. Start your social media and Craigslist blitz (heh) and sell the stuff in Miami. You guys could make a pretty good ongoing business if he can still get more stuff cheap.
Entirely dependent upon whether you personally guaranteed the debt.
Now that is as to liability. Don’t be surprised if a future credit decision is tied to a defaulted card with your name on it.