[londons_explore]

Doesn't work with Google. If you cannot log into the account, their legal team won't accept that you are the account holder. Even if you provide passport and driving license etc., they can't be sure, because you didn't upload the passport and stuff when opening the account.

[probably_wrong]

I'm having trouble deciding whether you talk about something that has happened or about something that could happen.

Assuming it's the latter: given enough evidence that you are you (same name as the recipient, deep knowledge of the account, knowledge of the password, etc), any court would rule in your favor and force Google to turn over the account. But I would be willing to bet that, assuming you are no one "special", they would relent much earlier in the process - the cost of the lawyers alone would probably outweight whatever profit they obtain from you, and GDPR fines can be high.

[londons_explore]

But there are also massive GDPR files for handing the data to the wrong person. Inaction is less risky.

[znpy]

Then you can sue, I guess.