Eh....
The grammar's good (Although I'd suggest capitalizing "I"s when they're on their own), but the actual appeal needs work. Most of it is the same thing rephrased multiple times to form a paragraph, and you saying that you "now know" you could get banned for impersonating doesn't make any sense given that you were already banned for it previously. In addition, saying that you didn't do it at the end devalues the appeal as it shows that the apologies that make up most of the appeal weren't exactly sincere.
You've got a good base, but it still needs some work.