Volatility is not something that can be controlled, but it can be faced and even embraced. And this is the beauty of bitcoin, a smart investor will use this to generate income or profits because volatility cannot be controlled but handled wisely.
to avoid bitcoin volatility, just do it long term, and also volatility may decrease over time as bitcoin will continue to be accepted and adopted.
And what you have to remember is that bitcoin is a future that will most likely be much better and can also be stable, bitcoin is not easy to predict but you can be sure that in the future it will become a very important and expensive asset.