Level of demand. At present demand of bitcoin is based on the exchange trading. We need to start significant trading of goods and service that to go beyond is it.
I think there are a lot of scammers out there who use bitcoin as their presentation that's why people do not trust bitcoin for this reason.
I think one factor that could affect bitcoin prices is bad news or FUD who can sell their bitcoin because they think that bitcoin prices will go down and another factor is there are some groups of pumps and dumps that can manipulate bitcoin values