I heard that many people lose their coins and the current volume of BTC is not current at all)
How do you think will Satoshi add some in future?
If you are asking about whether or not the amount of bitcoin in circulation can be increased then yes. This is done through mining. Right now, each mined block will reward you with 12.5 BTC newly created bitcoins and that's essentially how new bitcoins are generated on the network.
However, every 4 years the amount halves. So the amount will never be able to exceed 21 million bitcoins in total.
Later on when block rewards are low, potentially the amount of lost coins could outweigh the amount of bitcoins generated, meaning that bitcoin becomes deflationary.