My understanding of the blockchain and bitcoin is not very clear, but I see from some articles. Before bitcoin broke out, many people lost their bitcoin because they lost their private key or made the wrong address. And the number of lost bitcoin should be a staggering figure, then these bitcoin really can not find it back?
Or will there be other ways to make up for this regret?
No, when you lost your bitcoins,total number of bitcoins reduce and no one can back your bitcoins.
last two years a few people only loss them bitcoins
not true, the number of circulating coins might decrease but the number of bitcoins will never change. it is steady at 21 million whether you have your coins or not only effects the circulation.