BITCOIN, its not just a word but future of payment system and blockchain. It does goes on roller coster ride now in terms of price but once the guidelines are clear around the world . It will turn into kohinoor of 21st century.
In the market there are some whales who always try to manipulate the price by dumping there coins at large scale .this creates FEAR & UNCERTAINITY in market, seeing which many people sell their bitcoins at low prices. now once the price is very low whales again jump into the market and buy at low cost which later increases their power in market as they now command more number of bitcoins under them.
So what each of us should do , the answer is simple to do not fell in their traps and sell coins at take away price. Be courageous and smart. Altough there can be other factors like hacking, restrictions by govt. and etc. Hacking can affect the price in terms that the hacker dumps all the bitcoin stored in an exchange ( which recently happened in south korea) into market leading to sudden drop in price. Government regulations can cause panic in the market like lets say a country decides to ban btc then it will have a great impact on trade of cryptocurrency.