There have been many people I have met complaining about the loss of crypto assets because someone hacked it and this is happening to you. There is no way to return your assets, it's just that it's very important to anticipate unwanted things happening again. My advice is do not save the private key on a computer that is always connected to the internet, save it on a harddisk, flashdisk or a device that has never been connected to the internet. if you want to more easily and securely store your assets, store them in a hardware wallet, just simply prepare around $ 70 to buy them. as long as I use the hardware wallet does not have any problems.