You can track them in some ways but no other way to get it back. It happen to me before. As much I want to take revenge, I can't do it since I believe it was partially my fault. What can we do is just to move on and make sure it won't happen again. Being cautious is a must.
That's right. You cannot do anything about it. Because it is irreversible and immutable. The only thing you can do is protect your own. As much as possible, put 2FA in your account so that it is more secure. And always have your private keys safe.