Not a science more of an art I'd say.
Looks like support on that trendline isn't holding this time, can't be bothered drawing in the lines though. Thin volume, but on the market depth looks like price won't drop too much.
we're in a period of consolidation, and it's the weekend. last weekend broke a short-term trendline, too, but price simply consolidated around the $120 level until a significant breakout up.
what it is important for the bull picture is that we bounced off of the trendline on the way down, and also that we see a breakout up out of this triangle:
--arepo