Every so often we loudly hear about egregious mistakes, with legitimate accounts getting shut down. This is a result of large numbers: they're hosting billions of accounts, so one-in-million mistakes happen thousands of times (and believe me, they're tuning their processes for even less than one-in-a-million mistakes)
You say you have a lot of Google accounts. This could already be a red flag in the detection processes. One obvious way to "legitimize" these accounts is to have proper 2FA setup for them. Try not to share 2FA methods (like phone numbers or Yubikeys) across them, in a way that a fraudster might do to save time/money.
You're unwittingly a bystander in a silent war going on between Google and fraudsters. Neither of them are divulging methods they're using to detect/evade, so it's hard to give advice on how to behave legitimately. Try to do things that would be expensive for a fraudster, like the above 2FA advice.