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Typically an Apple ID is an email address you have used. If you are currently using a mobile device that is logged into your account, go to Settings and tap your name at the top.

Look in Keychain, and in a browser's security settings if you use it to automatically sign into Apple when using a browser.

This support article describes ways to find your Apple ID --> If you forgot your Apple Account primary email address or phone number - Apple Support

or go directly to this link --> https://iforgot.apple.com/appleid

If you find you can’t sign in, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple Account password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. More detail in —> Activation Lockout Issues - Apple Community

If you still need help:

Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."

Contact Apple Support - Apple Support

As was mentioned by the host of this community, there is a separate English language forum. There are many more contributors there and you would more speedily receive a solution to a question posted in English on that forum.

Apple Account - Apple Community

Hello! Thank you for posting in the Apple Support Community. We have a community for English here: discussions.apple.com. Since you’ve posted in English, we’d be happy to see you join us there.

Thanks!