Hello,
I am a pure CLI expert. Worked on AWS and other cloud hosting and configured server optimized for wordpress performance with security.
I can help you by solving your current issue permanently by deploying fail2ban and firewall rules. You will be protected from DDOS, Bruteforce and other similar attacks.
Do you have any server documentation ?
Please do let me know if you have any questions. I am available to discuss and start now.
Regards,
Ariful