Download freeleech torrents if possible.
First of all, Download massive amounts of small-size torrents. Like 200-400MB files, like 200-300 torrents.
Keep in seed for an extended period of time. In short, Harvest Bonus Point as much as possible.
Then exchange your bonus point with upload credit.
If your ratio is very low, then wait for any offers, Sometimes this site offers fully free-leech. Then you can download a large number of files, Which won't affect your ratio.
But don't know how many years you've to wait.
(There is another method available If you're really low on ratio. You can PM me anytime to get full details.)
The hardest choices require the strongest will.