DDos prevention tips.

I am pretty new to cloudflare and would appreciate tips on how to effectively deal with ddosing. My domains and subdomains are all proxied through cloudflare. It seems like even when i am using Under Attack Mode my website still suffers heavily from ddosing. Any advice would be helpful and i would be glad to give and relevant information on my deployment. Thanks in advanced.
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DDos prevention tips. - Cloudflare Developers