You have not used your account for selling for a very long time , many dormant accounts are used by hackers so sudden selling activity raises red flags to eBay.
Contact them, to verify you are the account holder, unless other restrictions are in place, your DSR ratings are very low, that should unlock your selling account for you.
Contact them this way.
Scroll to the very bottom of the page on the link below , and click on Contact Us.
