If you try to find an Apple account, you must enter the entire email that you created the account.
If you don't know your email, you can't ask for any help on Apple's homepage and customer support.
As far as I know, Apple is a very sensitive company related to personal information. I also tried to find an Apple account a few months ago.
If you didn't remember the email, there was no way to find it.
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Thank you very much