If the eBay seller account you want to use has been suspended for some reason by eBay, you need to reinstate that suspended account to continue selling on eBay.
It is highly recommended that you disconnect and uninstall all such apps that integrate your eBay Seller Account with the Shopify Store.
Using multiple apps to integrate your Shopify store eBay Seller Account may lead to duplicate order creation from eBay to your Shopify store.
Also, having multiple apps means a different user data feed may get uploaded to the eBay seller account from one of the multiple apps. This updated data may be incorrect/outdated in respect of the present status of the product.
To avoid any such inaccuracy in data, it is advised that you disconnect and discontinue using any integration service app for the eBay marketplace and Shopify store.

Setting Up a New eBay Account:
Checking Account Restrictions: