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.
Among all the things that the OP listed I think I will agree on the holding part. If people do this all together then the price won't fluctuate anymore but it doesn't make sense because for what if will just buy and Hodl without selling? Let's admit it that all of us came here because of the profit potential that bitcoin can possibly give to us. So I guess all we just have to do is like you said, faced it and embraced it.
Volatility isn't really that bad if we think about it because we can still be able to buy at lows and then sell at highs. We can avoid volatility and that is if we won't watch the price. We can go out for a while and come back after some years only to sell.