Steam account is not visible in the personal account on the website

To get add-ons from Steam, you need to link Steam and your personal account on the website. But the website has an account linked to it from the previous part of the game. I hardly played there, how can I delete it and link a new one? When I first launched the new part, I was not offered to change my account.

Same problem here.

Question is
Do you overwrite your Steam-PoE-account if you finish a full-link from your old PoE1 account (from this website)?

I wouldn't like to lose 540 hours of Steam progress (But I don't mind losing the content I have now here with this user)