Hi there! I hate to pile on, but I have a very similar issue and was wondering if you'd be willing to help. About a year and a half I lost access to a Gmail account with emails going back all the way to the beginning. Lots of sentimental messages, stuff like that. Logged into it after a long while, started looking at picture attachments out of nostalgia and somehow tripped an algorithm that locked me out. I stupidly did not have 2FA set up as this was not my primary account, so had no other way to offer proof that I was the rightful owner, despite having the correct password. I tried all the usual things - waiting a long time, trying old devices (phone, laptop), going back to the old location I used to live... nothing worked. Would love to regain access to years of memories.