Bitcoin isn't attached to a state or government, so itu doesn't have a central issuing authority or regulatory body, bassically, that means there's no organizational deciding when to make more bitcoins, digiring out how many to produce, kering track of where they are, so how does bitcoin work as a currency ?
You have not yet really familiarized yourself with Bitcoin. I think you have to read some more important materials about Bitcoin. There are also so many helpful and very informative videos about Bitcoin, its history, and its features. They are so educational. Bitcoin's supply is already final. A single Bitcoin cannot be added to the total supply anymore. Bitcoin is decentralized but then of course there must be a team that would maintain its functionality. But such team cannot have a central authority over the fate of Bitcoin. It is in the hands of the people.