If you call eBay, and walk them through this process, there’s a really good chance they’ll reinstate the account. They look at the account as a whole, especially since you’re doing a frequent amount of transactions, and I would assume based on my limited knowledge of Pokémon cards some of them are higher dollar transactions, that plays into and kind of trips, their internal “fraud” alarm. At the end of the day, eBay wants you to use their platform so if you can provide everything, they need to remove the flags, chances are good theyll reinstate everything. You might need to develop Ein number just for your LLC, but that part is easy and can be done online. I had to do the same.
This also strikes me less as a customer service appeal type issue, and more of a arbitration rights type issue, which you do have the ability to do under eBay‘s user agreement