You already got screwed up by leaving funds on a custodial service in the past, and you pretty much did the same mistake. Assuming what you're saying is true, you've already been in this space for more than 3 years. You should've known the risks of leaving funds on a custodial wallet/exchange by now. Especially Coinbase? Quite notorious for locking up accounts.

But anyway, since they're disabling your account, they probably smelled something fishy. All you can do right now is to wait and wish they respond soon.

You might want to check this out though: https://NotYourKeys.org/