Good Morning, the question is what kind of Anti-DDoS are using?
cloudflare this, if only you are attacked by domain, things change if the attack is ip, also would be good to change the SQL port of 3306 to another
What kind of S.O use?
Linux: You can work fail2ban + iptablet + APF + ddos brute stop +ddos deflator , ...
Windows: Anti DDoS Guardian, Kiwi-Guard Firewall, Anti-DDoS by crazy .......
there are lots of script antiddos / firewall
also something good would see the attackers ip, if a large amount of an area biene "Chinese example" you can ban the coun