Range Expansion And Contraction: What Works, What Fails, and Why?

A strategy that works in one environment may struggle when spreads widen, momentum disappears, or price becomes unusually erratic. I would separate results by volatility and market regime instead of relying on one overall win rate. Do you adapt the rules, reduce risk, or simply stop trading when conditions change? My preference is to treat this as a hypothesis, not a promise of profit. A transparent journal and realistic execution assumptions are more convincing than a polished screenshot or a confident claim from a popular account. In your experience, what specific rule or metric best separates disciplined use of this market structure topic from guesswork?