Urgent: Gmail Account Recovery Assistance

My Gmail account has been compromised and I urgently need help to recover it. The thief has changed both the recovery email and phone number, leaving me with no means of accessing the account. I've attempted recovery through Google's options multiple times without success. I do have some proof of ownership, such as emails and screenshots, which I can provide.

Ideal Skills and Experience:
- Expertise in online account recovery
- Familiarity with Google's recovery process
- Ability to handle sensitive information discreetly
- Good communication skills to understand my situation and guide me properly