Gmail Account Stolen Despite No Authorized Password Sharing

I am writing regarding my personal Gmail account with the address “sohaibmiloudi080”, which was stolen about a week ago and had its recovery email changed without my permission. Since this incident, I can no longer access my account. This Gmail account was used on my Android phone and I normally access it from Algeria. I did not share my password knowingly with anyone and I did not authorize any change to the email address or security settings. I have not yet been able to start any recovery process because I do not know which step will be effective in my situation. I kindly request that my stolen Gmail account be recovered and access be returned to me as the rightful owner. I also ask for an investigation into the unauthorized access and changes that were made to my account, and for any necessary measures to be taken to secure it and prevent similar incidents in the future.