The fact is that you were banned for plagiarism, but what's even bigger problem is that you didn't take a second chance when you were given one - now you're actually asking to be forgiven again, and you're unlikely to get the support of forum members in that request. I think now everything is in the hands of admins and global mods.
I am not sure if you mean I was banned before. Actually, I wasn't banned before. Solosanz reported my one post which was plagiarized. Then I edited that post and added the source link. After that, I edited another post. But, I was unable to find another one which caused me banned right now.
I hope admin will consider.
Waiting for a response from Admins/Moderators.