First, let's get one thing straight - you do not get kicked. The system will disable your download rights, temporarily. The staff will advise you on how to restore them.
Second, whatever you have downloaded just keep it seeding if you can. I have had people grab some stuff from me months after I had forgotten about the torrent.
I would never suggest people download anything just to improve their ratio. If you spot a healthy freeleech that you think you will enjoy, then grab it.
There are plenty of ways to add to your seed bonus to swap for upload gigs. Vote on what you have downloaded, upload pictures to posted torrents, join in the forums.
But the best way to improve your ratio is probably to upload your own torrent. It is very easy, especially after the first one. If it is the first one you can claim 600 bonus points. And you will get a credit of at least the size of the file. Just remember to check for duplicates before you post.
I have no idea what Fisto means when he talks about 'LOTS of torrents…' but then I don't know the site very well ...