Recover eBay Seller Performance

Hi there, I need ebay specialized regarding ebay seller performance recovery as I had 2 ebay stores with some transaction, late delivery and case defects older than 6 months on ebay stores. I want to recover store performance from below standard to above or top rated seller level... (Budget: $30 - $250 USD, Jobs: Account Management, Customer Service, eBay, eCommerce, Performance Management, Sales Management)