If you have Deleted your Gmail account by mistake and now you want to recover it then follow these steps:-
- Go to this URL - https://accounts.google.com/signin/v2/recoveryidentifier?flowName=GlifWebSignIn&flowEntry=ServiceLogin
- Provide them the email id which you want to recover and press next
- A message will show on your screen that “this account is recently deleted and maybe it is recoverable”
- If this message is not coming then sorry you can't recover your account.
- If this message shows then it will ask for your password, type your password and press next.
- If the process was successful A success message will show 

Read the full article here:- https://getassist.net/how-to-recover-permanently-deleted-gmail-account/