You already got screwed up by leaving funds on a custodial service in the past, and you pretty much did the same mistake. 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/

Because customer support is expensive. Why waste money on employing more staff when they can just increase their profits instead. You have just proved exactly why they don't need to provide better support: Even when users have terrible experiences with Coinbase and share them online, instead of people saying "Oh my god, that's terrible, I'm going to withdraw my coins immediately so it doesn't happen to me", users like yourself say "Well, it hasn't happen to me, so I'll just keep using Coinbase". Everyone thinks it only happens to other people until it happens to them, at which point it is too late to get your coins back. People continue to make post after post after post about how terrible Coinbase is, and users like yourself continue to ignore them until it is too late.

There is a reason that people have been warning against using Coinbase for years. There is a reason that there is an entire #deletecoinbase campaign. Do yourself a favor and take control of your own keys and your own coins.