Unlinking ea account from ps and relinking a new one

This I would suggest you ask support for.

In theory PC and PS has two different accounts with different progress, but seen as one because of linking. I would however take the time to actually contacting support with this one, especially if you spent your time building said account 😉

There are also some ToS restrictions when it comes to "moving" accounts around that can be smart to check out before getting to creative 🙂

Check this link: https://help.ea.com/au/help/apex-legends/apex-legends/play-by-the-rules-in-apex-legends/

Should contain all the info and contact points you need to handle this safely :D