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I meassure the height from the triangle's left bottom to top and place it at the beginning of the new 5 impulse sequence. Now that we've probable made a first Elliott Wave impulse I take 2.618 of the first wave which lands around the top of the meassure stick. Then I make an assumption that the 1st wave will be equal to the 5th which is common in Elliott Waves.

Does that make sense? :)

In cryptocurrency the 5th wave tends to be the largest

Yeah, but in this case, I think the total length of all 5 waves would be the same either way

Well it is just a fibonacci retracement points or smth like that... Those are points where the market will most probably resist 😊