Not an official club, but the unofficial club is full of members including myself unfortunately🙁...little you can do except consider DDoS mitigation service if it continues. 

It is a criminal activity, so you can report the attack to the FBI...they can't do much to be honest, but at the very least this is good to do in case the problem continues and/or you need to file a business loss with your insurance company barring you have Cyber insurance in your policy. 

https://www.ic3.gov/Media/Y2017/PSA1710172


From: NANOG <nanog-bounces+bclark=peregrinenetworks.net@nanog.org> on behalf of Mike Hammett <nanog@ics-il.net>
Sent: Monday, February 8, 2021 6:46 AM
To: NANOG list <nanog@nanog.org>
Subject: Retalitory DDoS
 
Is there a club for people that have been DDoSed? If so, count me in.

This one was directed at me (as opposed to one of my customers) because I got an e-mail explaining why I was getting DDoSed. Is that aspect common?

There were also some racial and sexual accusations that were made that clearly aren't true and just speak to the intelligence of people like this.

Is it safe to assume that they completely anonymized the email they sent to me?

Is there anyone I should be reporting this to?

I thought my site was running in Cloudflare, but my individual server was still attacked, so I gotta figure out where I screwed that up.


https://www.dropbox.com/s/rrrx90jvy09h26s/ICS%20DDoS.png?dl=0




-----
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP