The 21 million supply limit is one of the core design features of Bitcoin. If Bitcoin is created in the future, its value will decrease. So this program has been created with great care. By limiting the supply of Bitcoin, its value will remain stable. The maximum supply of Bitcoin is 21 million. This is a program set by Satoshi Nakamoto that cannot be changed. New Bitcoins are created through mining and halving occurs every four years, as a result of which the new Bitcoins created are halved, it may take until 2040 to complete 21 million.

Bitcoin devs can undo 21M supply cap but can’t force changes
How
bitcoin supply can be more than 21 million

I hope that if you take the time to carefully observe the discussions here, all your doubts will be cleared.