Urgent DDoS Mitigation Needed

My e-commerce site Enfieldshop.ru is currently under an active DDoS attack. No protective measures are in place yet, and service interruptions are starting to hurt sales and SEO. I have full administrative... (Budget: ₹1500 - ₹12500 INR, Jobs: Cloudflare, Incident Response, Internet Security, Linux, Nginx, Security Auditing, System Admin, Web Security)