How did you get banned? Did you went all in with the Full Marks event?
The best tip is just stay low in events where you contribute points to them and/or people can see your contribution and report you (FullMarks, Constellations or the house point type events), they will check your profile/account if you are doing an unusual amount of points. I got banned for the same reason when I reached year 5, since then I started again and took the tip to hearth and I have reached year 6 so far with no issues.