The most influential factor is speculation. Bitcoin speculation can bring huge profits. As a commodity, the value of Bitcoin is determined based on supply and demand. Bitcoins are extremely sensitive to demand and supply fluctuations, which are highly dependent on speculators.
In addition to the relevant information about countries accepting bitcoin payments, licensed trading floors, countries will strictly manage the use of bitcoin .... also impact not so bitcoin current prices .
As of today, many countries and territories are banning their own in the influence of bitcoin. Because of these unfortunate events, bitcoin's market cap will be lower than they want since buyer will also decrease and then the price goes down. But since the price goes down, there will be a lot of people from other land will buy bitcoin since the price is low, thus, the price will goes up again. Other factors are the occasion that are happening such as Christmas, New Year, etc.