The high volatility of bitcoin is one of the non-consumable characteristics of bitcoin as a form of decentralized crypto currency. Since the price of a decentralized crypto currency is not supported by anyone and is formed only on the basis of a supply-demand relationship that is never constant, high bitcoin volatility will always be manifested. Moreover, the higher the bitcoin price will be, the greater volatility it will have.
To bitcoin was stable, you need to change its decentralized nature, but this should not be done, since it will be a completely different bitcoin.