In short:
By the end of 2017 there was a sharp increase. Bitcoin price was about 20K.
Then the whole of 2018 and up to this point, the price gradually decreases. Now about 3.5K.
Constantly there are discussions about what will happen next. People are divided into two types:
1) people who do not believe that bitcoin will grow and think that you need to withdraw your money.
2) people who believe that bitcoin will increase in price many times, who believe that now is the time to invest in bitcoin.
I will say from myself. I admit the possibility of both outcomes. Therefore, I do not put all the money on Bitcoin. However, I inject bit of my savings into Bitcoin now at this price. I think this is logical. And if bitcoin drops even lower, I wont lose much on that.