Being talented individual is not enough. They have to play against other equally talented individuals in the highest level professional leagues from the age of 18 to develop tactically and technically. China needs a professional soccer league with top level foreigners or they need to send their best to European leagues. They can do it but it can take several generations.
Soccer is the most popular sport in the world and has most professional athletes by far. Best individuals from all over the world go to play in best professional teams, mostly in Europe and they continue to grow with better opponents and teammates. Talented Brazilians playing in top leagues all over the world a bring all that with them to their national team. Iceland (population little over 300,000) has professional players playing in England, Russia, Sweden, Netherlands ...