Using a debrid service like real debrid is pretty much paying a small fee for access to somebody else’s server that downloads everything from torrent trackers. So even if nobody is seeding, if it shows up on the service it will stream

Also if you still want to locally download media and stream it but Plex is missing the mark, you should try Jellyfin. It’s a similar service but open source and well maintained

jellyfin is an alternative

I do that with things I find myself rewatching often, like more than once a year. For other shows I might not watch again, I don't bother with using the disk space for them. I've looked into plex, but I'm too lazy to run a server myself.