Selling your device, what happens to your account?

Hello everyone, my PS5 unfortunately decided to stop working. I’ll be selling it for parts but I’m a bit concerned about what happens if the buyer is able to fix it. Of course I deactivated the console from my PSN account so its logged out, but the save data and the installed games are still there. So what happens to the games that have a separate account, like overwatch. Will the seller be able to access my OW2 account?