The price of Bitcoin fluctuates
There could be any of these reasons for fluctuations
Economic Factors - Supply / Demand fluctuations
Public Sentiments - Sentimentals attached to ownership of bitcoins
Charts and Trends - Technical analysis trends can have impact on price change
Market News - Banks or reputed individuals and other institutions forming opinions on Bitcoin survival and future
Legal Impositions - Governments posing restricitions or liberaliing use of bitcoin can have a critical impact
Security - Security concerns like hacking into popular exchanges can hurt sentiments in the short run
Mining Difficulty - In the case of proof-of-work blockchains such as Bitcoin, the mining difficulty of a coin can also have a direct relationship with its price.
BITCOIN long term prediction has always remained positive and it continues to remain positive as more and more people will start accepting and using bitcoins in daily transactions
Currently its use is only 1% and 99% is being bought as a digital asset.
People are considering it to be GOLD 2.0
But as its use and application increases, price in the long run will rise