How to retrieve wordpress blog when it's domain doesn't exist anymore

Hi, so I had this wordpress blog on my server and I had a commercial template on it, which I really need. But then I lost the domain and I moved my wordpress to a subcataloge on my other, still existing domain https://czepulkowska.pl/copartners/, but now, when I want to log into this wordpress I’m getting redirected to a domain that doesnt exist anymore, so I don’t even know if I have the right password. How can I recover my wordpress? Or at least recover template?