Sun Tzu doesn't know much about the art of war, so I'll talk about the Book of Changes. Neither the Book of Changes nor the Book of Changes clearly explains the "potential", but the concept of the Book of Changes is the same as yours. Among the sixty-four hexagrams in the Book of Changes, the "first hexagram" generally represents the initial stage of the development of things, such as the sixth day of the "Kun" hexagram: first frost and Bingxue. It means that if you step on the frost, winter should not be far away. From small things, you can judge the direction of things. In the sixty-four hexagrams, "Shang Yao" generally means that things reach the peak and things will reverse. For example, "Gan" hexagram 9: Kang Long has regrets, which means that your status is already high, and you have to go up, only knowing how to advance and not knowing how to retreat, so even if your status is high, no one will support you.

I don't think "potential" can be measured by a certain degree. I am a futures trader, and I know something about the trend. Usually, when the trend changes, there will be some changes, such as trading volume, positions and graphics. Moreover, it is usually after the trend changes, that is to say, after the new trend has passed a stage, it can be clear that the trend has really changed, otherwise it may only be a small adjustment in the megatrend.

Zeng Guopan put it well: "Flowers don't bloom, the moon is not round." Don't pursue perfection in everything. Flowers begin to fade when they bloom, and they begin to be scarce when the moon is full. The understanding of "potential" should be the same. Don't seek that turning point. When the trend comes, we can follow it

If you ask whether I ching describes the turning point of the trend, you can say that the whole I ching is talking about the change of the trend, or you can say that it is not mentioned at all. Maybe you don't know much about China's ancient philosophy. I ching never describes a so-called point, because time and space are changing, and it emphasizes the change of "time" and "position". "Time" has changed, and perhaps this so-called turning point will also change. Moreover, all the so-called things in the world will not change suddenly, and they are all processes from quantitative change to qualitative change.

You said you've been studying trends. To be honest, I don't think you have entered the threshold of "trend". If you want to study, I suggest you read books about cycles, which should be helpful to you. Anyone who makes stocks and futures knows that the change of trend is not a point, but a combination of graphs. If it must be said to be a point, then "point" is also a "point" in the macro sense.