Need HELP! Someone is duplicating my site and I need to stop them

Hello everyone, I have a site that's on Shopify and someone is copying the site exactly to 2 different domains. I have filed an FBI report, we have a DMCA protected image on the top of the site, I reported the site to Google via " suspicious site finder". I'm to the point where I want to DDoS a site or royally F*** their sites up. Any help in this direction or suggestions on the next steps to take? Maybe preventative measures?

Well I will say this:
"DDoSing is an Illegal cybercrime in the United States. A DDoS attack could be classified as a federal criminal offense under the (CFAA)." -so dont do that please.

Here is a response (2020) a Shopify employee gave to a similar question
Copycat site on Shopify