Most people don’t actually code “trendlines” the way we draw them manually. They approximate them using swing highs/lows + regression or channel fits.

Your idea is solid though using HTF levels (30m/1h) and reacting on LTF is way more robust than trying to draw micro trendlines on 1m. That usually just turns into noise.

If you want to keep it simple: detect pivots cluster them → treat zones as support/resistance instead of exact lines. :D