Fortune tellers usually say this sentence in two ways. The first refers to the fortune of life. According to Luo Shu's arrangement, the south is fire. If your constellation is based on fire, then when it comes to fire, it's naturally called south luck. Also into the southern wealth.
Another meaning refers to the geographical division of the whole country. The south of the five elements belongs to fire. Similarly, if your life depends on fire for money and money for use, then the fortune teller means that you have to go south to benefit your fortune.