Recover Hacked Instagram Account

My Instagram account has been hacked. I need help to recover it. Details: - I cannot access the email or phone number linked to the account. - The hacker changed my email or phone number. - I still know my username but have no old proof of ownership. Ideal Skills & Experience: - Experience with Instagram account recovery - Knowledge of security protocols - Ability to navigate support channels effectively Please provide a clear plan and timeline for recovery.