There are free options, but it's best to pay a monthly subscription from a provider. They have servers where things are posted. A decent provider has a long retention. I have Eweka, their retention is like 900 days or something, maybe even more these days. Then you need a download application, I use sabnzbd. To find posts, there are websites like with torrents or applications. Binsearch.info for example, and spotnet. There are also some closed communities. I pay for 2 indexers, which is 10 euros per year each, which will grab the post I need. The applications sonarr (for series) and radarr (for movies) download everything I add automatically when released, within the parameters I like. So, I don't want movies which are 90GB so I have limits. Also I don't like French or German dubbed stuff, so only original languages and with subtitles (if they at missing, I van download them through a kodi plugin from subtitles.org).

I haven't used it yet either, but I believe it's buy in nowadays. It was buy in for a while, then ISPs started offering free usenet access to attract customers, now it's buy in again.