Web security - protect from ddos attacks

I want to protect one page from ddos attacks i' getting alot of ddos attacks i lose traffic revenue , the page i want to be protected with ngnix cloudflare anything that can be done to dont get ddos attacks , the page is for irc chat , the name of the aplication is qwebirc
i'm using centos 7

example of the page i wanted to do https://mobil.clickchat.ro:2030

I lost revenue money from ads because of this ddos attacks my google ranking is down from 500 people only 50 left