The so-called first-tier cities, that is, cities with relatively high average level of people, advanced technology and very convenient transportation, such as Henan, can certainly not become the fifth first-tier cities, because the transportation in many places is very underdeveloped. Take my home as an example. The roads in many places have not even been repaired, but they are all improving, much better than before.
In my mind, Hangzhou is most likely to become the fifth first-tier city, because Hangzhou is not only suitable in climate and temperature, but also not as hot in summer and cold in winter as in our north, and its traffic is relatively developed and its living standard is high. There are many key universities and scenic spots, and many people often go there to play, so I feel that it will become the fifth first-tier city just around the corner.
Moreover, top universities such as Zhejiang University and China Academy of Fine Arts, which are national key training institutions, are all in Hangzhou, so it is natural to invest more manpower and material resources. As long as the state invests funds, the city will certainly develop, and Hangzhou belongs to the transportation hub. Many transactions are also held in Hangzhou, and many films are also shot in Hangzhou. Maybe you can see many stars when you go to Hangzhou.