Sorry for your loss. But as someone who Collected/ earned that many cryptocurrency you sure must understand how this work. Most people use this as a payment method and storage because they cannot be traced back. So when you lost them. you lost them.
When you have that much crypto it's always recommended to use a hardware wallet. I'm surprised you didn't use that to store 350+BTC. That's just unbelievable.
It will be much appreciated if you can tell the members how this happened. How it was hacked. so that they can learn a lesson and take actions for their privacy. Please do share that. I'm sure the community will be grateful for you if you do that.