Go to their help centre
https://www.facebook..../?faq=212666185422169
I deactivated my account. How do I reactivate it?
If you deactivated your account, you can reactivate it at any time simply by logging in with your login email address and password.
If you do not remember your password, you can reset it here.
If you can't remember which email address you use to log in to Facebook, click here.
If you have other problems logging in to your account, please review the frequently asked questions listed in the Login and Password section of the Help Center.
Tip: If your account has been disabled for security reasons or due to a violation of Facebook’s Statement of Rights and Responsibilities, you may need to contact us to regain access to your account.
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