Recover Locked Gmail Account

I’m locked out of my Gmail account because I no longer have the recovery phone on file. I’ve already gone through Google’s self-service flow using an alternate email, but every attempt stalls when it tries to send a verification code to the phone I’ve lost. No other recovery options appear. I need someone who truly understands Google’s account-recovery mechanics, escalation paths, and security policies to help me regain full, secure access. A successful engagement means I can sign in again and update the recovery email and phone so this problem can’t repeat. Please outline how you normally approach cases where both primary recovery channels are unreachable and what information you’ll need from me to start. If you’ve handled similar situations—especially “unable to verify it’s me” loops—let me know; that experience is exactly what I’m looking for.