Why is this happening with cloudflare?

Question

cloudflare

I installed protection through cloudflare, asked a friend to ddudo the site for me.
The site went down, looked at the logs on cloudflare, they show that 1 million+ requests came in, mainly from the USA, it even recognized them as "HTTP DDoS" and Action costs Block, i.e. did not miss the site. But nevertheless, the site lay down. How can this be fixed?