no you can only have one account. for one console.
and It isn't possible for you to unlink your Gamertag or PlayStation™Network ID.
only support can do that.
here you can get all the info, about account linking.
https://help.ea.com/en-us/help/account/linking-your-origin-account-with-your-psn-id-and-gamertag/#un...
https://help.ea.com/en-tr/help/account/linking-accounts-and-persona-transfers/
Can I link multiple console IDs?
An EA Account can only have one of each platform account linked at a time.
This means that you can’t link an EA Account to two PlayStation™Network IDs,
for example. Instead, you’ll need to create a new EA Account to link to your additional platform accounts.
If you try to link additional accounts, you’ll get a message that says Linked accounts found.
If you already have multiple platform accounts linked to an EA Account, they’ll stay linked,
but you won’t be able to add more. We suggest choosing your preferred accounts when you link them together.
but if you want. you can try ask support,
https://help.ea.com/en/
or if you are on Twitter.
https://twitter.com/EAHelp.
or if you are on Facebook.
https://www.facebook.com/EAHelpHub
