The factor that affects price mostly is, Market manipulations from the financial institutions,the news,the FUDs, and most importantly, technicals these are the things that you should be watching out as they are going to be a good trigger for your trades, this is the butterfly effect that is why we need to be sure to our all decisions before making a conclusion.
Yes that is right that there are so many factors which are causing the bitcoin price to increase. I think that the most important factor is the interest of the people in bitcoin. As soon as the interest of the people in bitcoin will continue increasing it will increase the bitcoin demand and so the supply will decrease which will in turn causes the bitcoin price to increase more and more.