One way is with Fibonacci sequences. Using the Auto Fib tool, if you measure a fib sequence of the previous swing, you’ll want to look for where the price is relative to the levels contained within that fib sequence.
Is the price in the upper or lower half of the fib sequence? In strong trends where buyers are in full control, the price has a tendency to pull back less than in weaker trends. If the price pulls back to this middle area, between the .50 – .618 retracement line, and immediately bounces and makes a new high, that can tell you that the trend is quite strong.
If the price breaks down below that area, then it’s fair to assume that a test of the low is possible but since the price is still technically in an uptrend, the expectation would be for the previous low to hold, and a new higher low be made.