You can try contact customer support, but it's a long shot. Usually they don't give in when they've suspended an account for being connected to another, unless they can see it's a huge number of accounts that shouldn't actually be associated or something like that. I've rarely heard of it being successful.
If you want to try, these are your contact options:
You can click the Help & Contact link and drill down to your issue, then begin a chat and type "Agent", or request a callback if that's offered (the phone reps are often less helpful, though).
Or you can contact them via Facebook, X, or Instagram:
https://www.facebook.com/eBay
https://x.com/askebay/
https://www.instagram.com/ebayforsellers/
