ignore the comments about Sonarr and Radarr etc, they’re for people who are addicted to downloading as much media as humanly possible, or folks in the US with 1990s internet speed. I’ve tried them and didn’t find much benefit to them.

This I really disagree with. Sonarr is absolutely terrible for backfilling shows with many seasons, it’s not at all what its for and you’re much better off manually finding season packs and downloading those and then binge. Sonarr is for monitoring shows with continuous releases and automatically download the new episodes so they’re ready for watching when they drop. I love not having to manually track when the few shows I do follow release new episodes and then add them to my client, because they’re just there in my library when they’re available.