Wow, half a decade is a pretty lengthy term, and in my opinion, you definitely learned your lesson and maybe deserve a second chance. Especially considering that upon reviewing your past threads, it appears that you weren't involved in any bounty campaigns at the time of your ban. This fact leads me to believe that your actions were not motivated by financial gain, but rather a lapse in judgement or a misunderstanding of the rules. Either way, I'm confident that you have grown from this experience.
From what I gather, some members who committed similar offenses in the past have already received pardons, so I think it's about time for the admins to give your case another look. I don't know all the details about how much you plagiarized, but if it was just a couple of instances, maybe they could go easy on you this time around.