Some tips to avoid your ban:

• Adjust your client upload/download settings.

• Keep seeding what you've downloaded.

• Have a look at the list of orphan torrents.

• Satisfy a reseed request.

• Create a new (loseless) audio or (dvd) video torrent making sure it isn't already available among the torrent list.

• Check the forums: sometimes you may find contests to earn free GBs