I'd suggest to recover your account and burn it first: Register in a hell amount of random services for a few weeks to make it confuse about you, so their data about you will be imprecise which has no much value for them.

BUT... don't be too obvious, make it look like a legit behavior. We must assume they can spot a timestamp when you started burning it.

I say that because I did the same, straight deleted my Google account, but I wish I realized it'd be better to burn it first.

Anyway, not a mandatory thing, your data will become useless eventually, up to date data is more valuable for them than outdated data. They probably just ignore/delete old deleted accounts indeed, since it has each time less updated info.