often see people difficult to getting upload traffic on PT, now you can try this way, add some public trackers to ur private torrent and share it.
Not only can it increase your ratio, but it also increases the probability of seed preservation, cuz some cloud-drives can download public torrents (Private torrent with added public trackers are also can be downloaded by it), ensure that sometimes when the BT seed dies, there is a backup in the server.
You should check because this is probably against the rules of the private tracker. They usually want you to create a new .torrent for uploading to a publing tracker.