Your seller will not be able to help if the item has already been posted, and they will post to the name and address eBay provide, the one you have on the delivery details on your order .
The only thing you can do is to send a message to your previous new owner of your past address, to either send it on to you, or as you suggest hand to a neighbour?
So this doesn't happen again , change your address on your eBay account.
There are 5 addresses which need to be corrected :
https://accountsettings.ebay.co.uk/uas/addresses
@leafar8501