When torrenting your client should be “Connectable” which means fully accessible from others. You can use the guides others have posted to achieve that but basically, an unconnectable client can still seed to those who are connectable, but two unconnectable clients cant connect to each other. Or at least this is how it has been described to me by a private tracker.

Personally I use Kavita on my server that houses all my *arr apps. Not for everyone but I enjoy it.