Go to the link below, scroll to the bottom and use the "contact us" option.

https://www.ebay.com.au/help/selling/getting-paid/getting-paid-items-youve-sold/payments-hold?id=481...

Edit to add. Since you haven't sold for over a year eBay sees you as a new seller and will hold funds until you can show by feedback and/or tracking that the transaction was successful.