If you got busted for plagiarism, there's little chance your ban is going to be reversed and you can forget about any improvements, because you're done on bitcointalk.
Lovesmayfamilies had warned Natrixxx on Nigeria local thread before about his ways of posting, CryptopreneurBrainboss warned him also at the time not to be quotting excessively which makes his post of low quality. And in fact, I was the one that warned him the most.
The reason he was banned would likely be what lovesmayfamilies posted above, while copying and pasting articles from another sites which he was excessively doing in form of quotting before but later using only links. This is highly not professional and making his post of low quality which veteran members of this forum will all against.
He created a thread
yesterday with such copy paste but link included, the thread was taken down and later his account was banned, the reason I think it could be the reason for the ban.
But with all what have been posted above before mine, no solid evidence that Nathrixxx plagiarized. It will be good if there is concrete evidence that he truly plagiarized by not adding a link. Or it will be best if moderator can let us know the reason he was banned, maybe not even about plagiarism.
My view about this may not be correct and I will like correction if wrong about anything.