In the event that you have attempted every possible option of account recovery and are still unable to get back in, you might want to give Google support a call.
Describe the circumstances, including as much information as you can to prove your identity, and indicate how urgently you need to access your account.
Your best shot at fixing the problem is to contact Google's support team, even if there's no assurance they can retrieve your account. If it's feasible, we can offer you our support.
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