Consider short-term trading on an hourly chart (1-2 weeks).
After the figure of the head and shoulders took place,
the price was to reach a height equal to the height of the “head”.

At the same time it is necessary to do it with force and confidence. But if it doesn’t happen, then something is wrong.
And the figure may already be wrong.

And the figure may be wrong and there will be no reversal for some time.
Therefore, a more conservative option should be considered. In this case, I reject the fall below, referring to a more general schedule. Most likely, you need to promote price movements in the range (two arrows).
From them we draw two lines, (we create a range) the tendency of the upper line may be a little lower, as we do not have enough information that the downward trend is over, but at the point there is enough strength to draw the figure “head and shoulders”.