May I ask if the Inner Hall tickets of the Forbidden City can be purchased separately? I have already booked a free ticket for minors with preferential treatment (excluding Inner Hall tickets), but I also want to visit the Inner Hall. What should I do?

You can buy tickets for the Forbidden City separately, but you can no longer buy tickets on-site. All real-name online reservations will be implemented, and tickets will no longer be sold on-site.　　
Can be purchased separately, but must be reserved in advance.
You can buy anything online.
You can buy it independently, then buy it separately