the increase in bitcoin prices is so fast that I can not take advantage of this excellent opportunity.
That is pure nonsense. Everyone has had enough time to buy as many coins as possible far below the current market rates. For some reason people always wait for something to happen before they start buying.
What that something is, I don't really know, but if you time on time again miss out on great buying opportunities, you simply don't know what you're doing, or you're too afraid to take action.
It was like that at the time the price was sitting below the $1000 mark, and it's still like that today. Like seriously, how many chances need one to pass in order to realize that they are not moving forward?