This person.

Are you kidding me? Like, seriously?

Okay, let's get stuff straight. Fireworks were first documented to be used in 7th century China. Whereas,

Paper-making is known to have been traced back to China about 105 CE, when Cai Lun, an official attached to the Imperial court during the Han Dynasty (202 BCE-220 CE), created a sheet of paper using mulberry and other bast fibres along with fishnets, old rags, and hemp waste.

So, supposedly, the Chinese never invented anything after the 7th century AD, amirite??? Well...

Development of the banknote began in the Tang Dynasty during the 7th century, with local issues of paper currency, although true paper money did not appear until the 11th century, during the Song Dynasty.

I'm pretty sure paper banknotes were invented after paper...

Also, bombs.

Explosive bombs were used in China in 1221, by a Jin Dynasty army against a Song Dynasty city. Bombs built using bamboo tubes appear in the 11th century.

Certainly after the invention of both paper and fireworks, right? Well, you also have the sport of Chuiwan.

The book Dongxuan lu, written by Wei Tai (fl. 1050–1100) of the Song Dynasty, describes how a southern Tang official teaches his daughter how to dig goals in the ground and drive a ball into them.

Other stuff invented/discovered by the Chinese after both fireworks and paper:

1 . Using coke as a fuel.

By the first decades of the eleventh century, Chinese ironworkers in the Yellow River valley began to fuel their furnaces with coke, solving their fuel problem in that tree-sparse region.

2 . Dominoes

The oldest confirmed written mention of dominoes in China comes from the Former Events in Wulin (i.e. the capital Hangzhou) written by the Yuan Dynasty (1271–1368) author Zhou Mi (1232–1298), who listed "pupai" (gambling plaques or dominoes) as well as dice as items sold by peddlers during the reign of Emperor Xiaozong of Song (r. 1162–1189).

3 . The Fire Lance

The first fire-lances were seen in China during the 10th century

Ok, I'm not going to go too deep into gunpowder-related devices from here on, because there are a ton of them invented after fireworks(makes sense, because fireworks were one of the earliest uses of gunpowder.)
4 . Smallpox inoculation.

Joseph Needham states that a case of inoculation for smallpox may have existed in the late 10th century during the Song Dynasty (960–1279), yet they rely on a book Zhongdou xinfa written in 1808 by Zhu Yiliang for this evidence. Wan Quan (1499–1582) wrote the first clear reference to smallpox inoculation in his Douzhen xinfa of 1549.

5 . The Chinese Magic Mirror.

In about 800 AD, during the Tang dynasty (618–907), a book entitled Record of Ancient Mirrors described the method of crafting solid bronze mirrors with decorations, written characters, or patterns on the reverse side that could cast these in a reflection on a nearby surface as light struck the front, polished side of the mirror; due to this seemingly transparent effect, they were called "light-penetration mirrors" by the Chinese.

6 . Mahjong.

One theory is that Chinese army officers serving during the Taiping Rebellion created the game to pass the time. Another theory is that a nobleman living in the Shanghai area created the game between 1870 and 1875. Others believe that two brothers from Níngpō created mahjong around 1850, from the earlier game of Mǎdiào.

7 . Playing cards

Playing cards were invented in Imperial China. They were found in China as early as the 9th century during the Tang Dynasty (618–907).

8 . The very first restaurant menu

Menus, as a list of prepared foods, have been discovered dating back to the Song Dynasty in China.

Note: The Song dynasty dates from 960–1279.

9 . Tangram.

It is reputed to have been invented in China during the Song Dynasty

10 . Artemisinin, malaria treatment

In 1967, a plant screening research program, under the name Project 523, was set up by the Chinese army to find an adequate treatment for malaria; the program and early clinical work were ordered of Chairman Mao Zedong at the request of North Vietnamese leaders to provide assistance for their malaria-ridden army. In the course of this research, Tu Youyou discovered artemisinin in the leaves of Artemisia annua.

Well, I'm gonna stop here. I really didn't have much time, so most of this is really low effort, as you can see.