Think in zones
Prices rarely react to an exact pixel. A zone can represent a prior decision area, congestion or an imbalance between available orders.
Count the quality, not only touches
Repeated tests can confirm that an area matters, but can also consume available orders. Consider the strength of departure, time spent and market context.
Define failure before entry
A useful level includes a clear condition for being wrong. That condition should come from market behaviour rather than an arbitrary distance.