There is no way to unlock any Apple device (iPod, iPad, iPhone, Watch, Macbook, etc) when it's locked to an iCloud account. The only way to unlock is to get the password to the Apple ID that is currently mated to it.
You have a paperweight. I can confirm...I bought a Watch that was locked to iCloud as well. ZERO chance of bypassing it yourself. Only the user who mated to the device can "unlink" or whatever and free it up for others to use.
People who claim to be able to unlock must be wiping/reformatting the device with a base OS.