Usually In technical analysis the last move after break out of the triangle is final move before the trend reversal.
One of the reasons of following behavior - triangle is usually pattern of the wave 4 by Elliot count, breakout is wave 5 and after that we have an ABC correction or higher time frame trend reversal.
ON ETH/USD daily chart We see the price was breached out from the triangle and reversed exactly on it target (100% of the triangle height).
Also we have massive volume increasing => it is a sign of a lot of buyers.
I will update this idea!
Good luck!!!
p.s. For the possible targets of this perfect trade idea you can look my previous analysis