Low TPS on paper spigot server

Hi, I really need a lot of help with my server.

Today we have about 30-40 people on the server and tps were around 10-15.

Here are my timings report.
https://timings.aikar.co/?id=8f6a1c0a601f4e8fa1dd59fd2000666f#timings

Please help, this is very important.

please, i really need help.