Not all trendlines have to be build using higher highs and lower lows. Some work perfectly as a trend direction and parallel channel middle line. The more bounces it has the more important it is for the chart (not stronger, but important). Also pay attention to volume - it should increase at line cross or bounce zones, confirming the line.

Example - look at blue trendline that worked as SR through all the way MCO made up, before BTC cracked it down. Breakdown of trendline started fast dump. In combination with horizontal SR line crossover price movement increase exponentially.
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