Snapchat Account Recovery / Digital Forensics Specialist

I need help recovering access to an old Snapchat account that belongs to me. Current situation: I know the Snapchat username. I know the full name associated with the account. I know the phone number that was linked to the account, but I no longer control that number. The phone number is still active, but it is no longer under my control. I no longer know or have access to the Gmail account associated with the Snapchat account. I do not know the Snapchat password. I do not know the Gmail password. Both the Snapchat and Gmail accounts had 2FA enabled. My current phone has never previously been logged into either account. I currently have no password leads for either account. I am looking for someone experienced in legitimate account recovery, credential recovery, digital forensics, mobile/browser forensics, authentication systems, or account-security troubleshooting. Before beginning recovery work, I want you to assess the situation and explain what legitimate recovery paths may still exist and what information, devices, backups, credentials, or proof of ownership would be useful. I am particularly interested in someone who can investigate owner-controlled recovery options such as old device/browser artifacts, saved credentials, account identifiers, backups, recovery factors, email-account recovery, password-manager history, authenticator information, or other authorized recovery routes. I am NOT looking for someone whose entire service consists of repeatedly submitting generic Snapchat support tickets or repeating basic public password-reset instructions. This account belongs to me, and all work must remain authorized, lawful, and compliant with applicable platform rules. I am not requesting phishing, unauthorized access to another person's email or phone number, SIM swapping, exploitation of Snapchat or Google systems, or circumvention of third-party security controls. Please briefly tell me: What type of account-recovery or digital-forensics work you have done before. Whether you have worked with Snapchat, Google/Gmail, 2FA-locked accounts, or similar cases. At a high level, what you would investigate first in a situation like this. Whether you are open to a short call through Upwork before we proceed.