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A trendline with three or four clean touches looks like proof of a strong trend, and that is precisely why it attracts so many orders. Buyers place entries at the line, and their stops sit just beneath it. When enough orders stack up in the same narrow area, a brief push through the line can fill large orders efficiently, and then price often resumes in the original direction or reverses sharply. People call this trendline liquidity. I do not trade the line itself. I treat it as a pool of stops and wait to see how price behaves when it breaks. If the break is a quick wick that closes back above the line, it was probably a sweep and the trend may continue. If price closes beyond the line, retests it from underneath and fails, it was likely a genuine structural change. The mistake is deciding in advance which one it will be. Mark the line, mark the nearest swing structure, and wait for the close. Also remember that the more perfect the trendline, the more crowded it is, so give your stop a buffer beyond the obvious area.

Treating the line as a pool of stops instead of support changed how I look at trendlines too. The third or fourth touch is usually where it breaks. Something I find useful is to check whether the break happens with displacement. A slow drift through the line often leads to a retest and continuation of the old trend, while a sharp break with a close beyond tends to mark a real change.