I used Anki some years ago and there I had an old email.
I deleted this email, literally deleted it and no longer have I the chance to confirm again this email to get into Anki.
I had more or less 8000 cards using that email. Is there any way I can log in this account again and export my cards to another account?
In that case, the data has been long deleted anyways and your cards and review history is gone. See Syncing with AnkiWeb - Anki Manual.
Do you still have any of the devices you synced with that account? That’s the best place to look for the most updated version of your collection. And if you’ve got that, then you don’t need to recover your old account.