Telegram Account Inaccessible Because Of Lost Phone Number

I am writing regarding my old Telegram account with the username @KinHerbertSh***r. I have been unable to log in to this account since September 2025 because the phone that contained the SIM card linked to this account was stolen. I no longer remember the exact phone number I used when I created the account, but I still know the username and password and can provide any additional information needed to verify my identity. When I try to access Telegram, I only see the option to log in with a phone number, and there is no option to log in directly with my username and password. Since I do not remember the phone number used, I am completely stuck and cannot reach my account at all. I kindly request your assistance in helping me regain access to this account using my username and password, or by verifying my identity through any other available method you may offer. I would like to continue using this account securely, and I am ready to provide any further details or proofs you may require to confirm that I am the rightful owner. I ask that you review my situation and inform me of a clear solution or alternative so that I can log back into my account and secure it properly.