And... let's just compare my personal finances to Google's finances.... carry the 1...
Today, denial of access to one's data ought to be a human rights matter.
Since Google's processes don't seem to give access to that, you might have to sue them. If they failed to show though, you should be able to get a default judgement eventually.
(note - GDPR is in some cases privately litigable, so you don't need to wait around for a snail's pace regulator - you can indeed sue for relief and get your legal costs back in the award. I'd expect a lawyer would take this case on a contingent basis given how clear-cut the GDPR is about your right to access your own data).
Certain approved consumer groups are also able to do this as well - the regulators are too slow right now, but others are gearing up to start taking cases themselves.
Check your local laws.