How to change one's archetype?

How to change a player's archetype?

The only way to do so in-game/legitimately is to start MyCAREER over again and create a new player with the Archetype and attributes you'd prefer. I'm guessing there's probably a way to do it through the Limnono Trainer or Cheat Engine, but I'm not aware of the steps so I can't elaborate. Also keep in mind if you do that with an online MyCAREER save, there's a good chance you'll end up being banned (even if you don't manipulate anything else to your advantage), so attempt it at your own risk.