Can I unlink a platform from my account?

Indeed, it is possible to do so.

1. Proceed to your account’s Connections section and opt for the DISCONNECT option on the relevant connected platform.
2. Within the dialogue box titled “Disconnect [Platform Name],” ensure to tick the box to confirm your understanding of the warnings and your intention to disconnect your platform account from your WB Games account. It is important to note that depending on the platform, once you disconnect a platform account from your WB Games account and connect a new one, you may be unable to disconnect it again for a specified duration.
3. You have now successfully disconnected your WB Games account from your platform account.