I think you should monthly buy something something, this way you can be sure that some day you'll be at the lowest low, and you'll buy even more... Ofcourse you can wait till the price is right by your opinion, if it gets even lower, even so great for you because you can buy even more. The problem here is to predict when it's that time,...? 
It is impossible to really predict further developments in the cryptocurrency market. Perhaps we will see another big request not prices, click to observe today. But each of us knows about the great prospects for cryptocurrency in the future, and thanks to this we can be sure about investments in truly promising and in-demand projects.