How can I find the IP address of a user that visited my website to further blacklist them from accessing?

Hi, so I’m working on a website and I realized this user is requesting a lot of data and ruining my reputation by DDOS’ing my website. How can I find the IP address of this user via Cloudflare? I only use Cloudflare as my host so I cannot use an external site or my site holder as it is not possible. Is it possible to do it in Cloudflare?
A bonus question: How can I blacklist the IP address from accessing my website entirely after finding it?