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?
Not sure if you're serious. It is impossible to add the current cap of the total no. of Bitcoins, unless there was a hard fork. You should know this.
But if ever there was a proposal or something, I do not think it would have enough backing from the community. The proposal would undoubtedly be ridiculed.