Apple watch Series 3 recovering issue.
Hello,
I have an apple watch series 3 that needs to be recovered or simply unpaired. But I recently changed an iPhone and the old iPhone 7 was traded in, the apple watch is still currently paired with the iPhone 7 and is not able to be unpaired by me because I recently deleted the apple watch off of my apple id. Even though my apple watch displays it is still under my apple id, which might just be because it isn't connected to the internet and cannot refresh. There are a few proofs that the watch was mine originally from the contacts app on the watch, under "my number" it shows my address, Is there anything I can do to recover it?
Thank you for your time.
Apple Watch