It’s not so much that I can’t find things on torrents, it’s that I don’t have to worry about something not having seeders so it’s more reliable for old uploads. In addition I’ve found it to be better for single episodes, multiple release groups that I use seem to only use Usenet.
As for things that aren’t movies/tv, I think Usenet is better for slightly more obscure content, such as comic books.
1337x is my favorite right now for TV/movies and Nyaa for anime. Between that and Usenet, I can get 99.5% of what I want.
I use qbittorent and Sabnzb for downloads.
Since you’ve been out of the piracy game for awhile you may consider looking into *arr apps (radarr, sonarr, prowlarr, etc). They can auto download movies/tv you want and format them in a way that Plex/Jellyfin like, so you can get a whole library of content with just a few clicks. There’s a bit of a learning curve to the setup though.
Why both Overseerr and Ombi?