Google doesn’t provide another way to sign in to this account

By mistakenly i deleted  my child account  and now while login getting below error 

Google doesn’t provide another way to sign in to account please  help 
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I don't believe Google Workspace supports Family Link/Google for Families but if you do happen to be a Workspace admin and it's happening on your domain, then contact Google's one on one support option for admins: https://support.google.com/a/answer/1047213.

The Google for Families (which would include Family Link since accounts under age 13 [in most countries] have to be under Family Link) support that I know of would be located at https://support.google.com/families/contact/families_emailhttps://support.google.com/families/contact/chat_new, https://support.google.com/families/contact/email_new, https://support.google.com/families/gethelp. The entire help center is located at https://support.google.com/families/?hl=en#topic=7327495

I want to return with my Gmail password.i don't know how it was deleted unintentionally.i have a lot of important information in this Gmail that is very necessary . A humble request to google what can i do to get my Gmail back ? please help me anyway

See https://support.google.com/accounts/answer/7682439?hl=en

The people on this community site don’t have any special access to be able to help beyond the steps in that article.