Ubisoft account forever inaccessible?

A few years ago (around 2018), I created a Uplay or Ubisoft account that was linked to an email address whose Google account was later deleted. Now I wanted to log in to change the email address, but authentication was activated that required email confirmation. However, this no longer exists, and I redeemed some game keys on this account that I can no longer play. I tried to restore the Google account, but too much time had passed, and it no longer worked, which means this option is no longer available. Does anyone have a solution to my problem?