Thank you for sharing your story with all of us @hassanabid
Hopefully it will be a reminder for all of us, that keeping liquid steem in our wallets is very risky (since it can be withdrawed without any kind of user verification).
I myself got hacked sometime year ago and I've also lost quite a bit. Luckily I've noticed that power down has been started so I managed to change keys and cancel that powerdown.
Since then I'm visiting all few accounts under my management every now and then, to ensure that no power down is happening.