LoyceV asked me to edit my posts and add the sources. I have edited a few posts, but I could not edit all of them because I forgot if they were copied or not.
That was dumb. You should have searched for the source of each post (that's how we catch plagiarism), or you could have deleted every old post just to be sure. You've had several chances to correct all your plagiarism, and you didn't take them.
If you want any chance to turn your ban into a signature ban, you should focus on this:
If you think that a ban should be ended, make your case in a new topic from a "good for the forum as a whole" perspective.