how can i make a torrent that i have already uploaded before show up again as a new one??

If it's been deleted off the system, you can start over again and it will show up as new.

If it's still on here, it would have to be "promoted" by a moderator and it would show up with with new torrents with the recycle symbol in front of it.  I don't know how the moderators decide which old torrents to promote/recycle.  With nearly 150,000 torrents on the tracker, they can't do this for all of them.  Perhaps a moderator will shed some light here.