I seed EVERYTHING until i run out of space. Qbitorrent doesn't like me having .torrent files in more than one drive, so i'm limited to my 14TB. But i have dozens of torrents that i'm only one of 2 or 3 people seeding it, so those help me upload hundreds of GB's with my terrible connection.
Also i'm on a private tracker, so leaving them seeding helps your ratio, even if you don't actually upload anything. They just try to encourage new people to seed and that is awesome.
Mine is a odd Xbox torrent with like a 39 ratio. Everything else is like a 2.5 or 3 ratio max.