Viewed from your chart it's only from March – April,  You should see from chart / graphic bitcoin movement every year, almost forming the same pattern, I'm sure pattern will be repeated this year certainly rise at the end of this year.
Indeed, predicting bitcoin value is quite difficult because of different causes can be due to bitcoin trend, demand & supply, negative Issue of bitcoin, world government policy, etc. hopefully at the end of this year runs the same as the end of last year