Prices have been falling continuously, reaching a temporary low point (at the first circle). After that, the price briefly broke below this level and created a new low at 5564 points. This low position had very little trading volume and was just a fleeting moment; therefore, its support effect on the market is not as strong as that of the previous secondary low point.
When the price rises and pulls back to the previous secondary low point where it receives support, we can use the previous secondary low point as a basis to enter a long position. Note that it is best for an upward market to be accompanied by increased trading volume. At the second circle, as the price rises, the trading volume below is also increasing, which makes the possibility of an upward movement greater.