I think the lost bitcoin cannot be revived and the bitcoins volatility is just normal because every day bitcoins are always mined. The population of users also affect with the loss of bitcoin.
According what I read binance has been hacked I don't that was a true news or fake. But if ever it is true it is also one of many reasons why bitcoin crashed down or being volatile right now.
Bitcoin volatility is normal for those who know about bitcoin. As you can see the chart you will noticed that it looks like a heart beat graph.
Moreover maybe also bitcoin is volatile because of the big investors in bitcoin used their funds.