DDos stopped my site more times. Slow and unusable

MY site is ppcrn.eu. in this and last weeks more time ddos attack stopped my site. Today i have more than 3 times attack. Cloudflare is not enught or my settings are not good. Please help me. Thanks.

You may enable Under attack mode or configure as:
Read this article: Understanding Coudflare DDoS protection

Better to start here: