If a torrent is missing, we have the Requests part of the forum to ask for them.
If a torrent still listed is not seed, there is a button "Request Re-Seed" at the bottom of the description.
It will send a re-seed request Private Message to more than 100 last completed downloader.
(therefore use it with care, only once, else you risk to be reported as spammer)
As long as the torrent is still listed (last activity < 7 days), you shouldn't post it again. It will be a duplicate. Tow choices:
1/ either join it re-seeding, especially if there are leecher, it will assure you good upload
2/ or wait until it is de-listed and you can post it as a "new".
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