What are these factors caused the price bitcoin is very easy to volatile?
IMO, if people get some news about bitcoin, it can be bad news or good news. But, sometime bad news its just fake to make people do panic sell and make some dump on bitcoin price.
How do we as treaders overcome an unstable bitcoin price loss?
You got some options, if sometime bitcoin price is really going down and you scared, then withdraw it when you already on profit or doing some cut loss.
If you want more risky, then just HODL.