Would you volunteer for that? If so just ask at over at the mailing list or in the bugtracker if and how you can help out with this problem. (But be warned: You might also get the responsibility to manage all releases for fedora not just the copr repo for the nightly builds.)
I bet the reason why this copr died 7 month ago is because the person who originally maintained it has no time for it anymore.
The person maintaining COPR build has replied, I have sent a PR and now build fails differently after about an hour of compilation because of a different problem. This is a problem of KiCad itself and I have sent a patch there as well (https://bugs.launchpad.net/kicad/+bug/1679795)
Hopefully this will be solved soon. Often all it takes to fix these build issues is for someone who is familiar with the OS and distribution to help the developers sort things out.