Your sales dropped without obvious reason? Check if eBay or other platforms have technical issues here: Downdetector 

Convert text to other cases e.g. from ALL UPPER CASE to Capitalized Case: Convertcase

Increase SEO for your site and listings with backlinks, for free here: Pingler

Increase your Site’s SEO by helping the Google finding you by manually importing your URL to its index Here (you must sign in with a Google account)

Increase your eBay store’s SEO by manually setting related to your store keywords. Follow this eBay guide to walk you through.

UPC lookup Database: UPCitemdb