All the content on my site was stolen. How to behave?

Went all day, thought, worried. And only now I realized that no one will help me so skillfully as Habraludi. Therefore, I appeal to you, I hope the format of a personal blog on Habré allows it.

I'll be brief. The newly-born competitor site has stolen absolutely all the content of my resource. The whole. For 4 years. Found it randomly through search engines. Actually, it is only through search engines (and for search engines) that they give this content: you can’t reach it through the links on their website.

The request to delete the content was ignored. How do you advise to do in this situation? Thank you in advance for your help.