Multithreading of Minecraft server

There is a Minecraft server on the Paper core, it is located on a machine with the following characteristics:

• i7 3770
• 16 Gb Ram

Tps on the server sags to 15, when online rises to 20 Even if you put the server on Intel core i9 9900k 5 Ghz (I think this is the best option if you look at one stream), the server will not withstand online 100 players. And here the main question is, how can the server be divided into threads? If there is another option to raise of course, I would be glad to hear it. I was looking for information on the issue of dividing the server into processor threads, but I did not find any solutions.