In my opinion, the increase in bitcoin is not caused by a trend but by something that drives people to want to buy it, what is that? It is a success in the future and those who buy bitcoin for the long term because they believe that in the future bitcoin will continue to develop and advance so that it is in great demand by everyone. Market conditions like this will continue until 2025, making the price of bitcoin even higher, that's why everyone is flocking to buy it.
What makes people want to buy Bitcoin is not just the success in future, but what will make people to buy Bitcoin is the future scarcity.
As you may know, the maximum amount of Bitcoin that must exist is 21 million, already about 20 million has been mined and the circulating supply is around 19874725 as at today.
Now, scarcity enhances demand/supply, and drive prices at intervals; an increase in demand will cause price to increase and the increase supply will cause a decrease in price vice visa.
In a nutshell, the number of Bitcoin that must exist is about to be fully mined and the Cryptocurrency community know that there shall be scarcity in the future that will definitely increase the price of Bitcoin. It is obvious that Bitcoin future is very bright.