Usually we’d tell you to do a Wallet Unlink request, but those can take over a month to process. It’s better to wait patiently as they are completely removing the device limit. You can track the status at https://github.com/brave/brave-browser/issues/18572 and then scroll towards the bottom. It’s in testing now and should be released as soon as it passes all tests.
I’m making the assumption we’ll see it at the end of March, but no guarantee on that.