Get a good VPN that allows port forwarding. I can recommend AirVPN
Use Linux (of course)
Install qBittorrent as the torrent client.
Enable the search tab, under plugins install the Jackett plugin
Install jackett (on NixOS it is easy, otherwise you can use podman or docker to run the container image (preferrably NOT from docker hub but this registry, use podman)
Open 127.0.0.1:9117 in your browser and set an admin password, copy the API key. Add all public torrent sites possible, it will take a long while and might make your computer go wroom.
Search for something in qBittorrent, you will get an error as you dont have the API key configured.
Open the description page, it opens the browser and explains where to find the configuration file. Add the API key here
Search things
More advanced shit

I will make a post about my setup

Basically, dont use the sites directly, use a search engine that scrapes them. You need flaresolverr for some sites using Cloudflare. Apply for some private trackers, join communities to get invites. Remember to seed as much as possible and avoid hit-and-run.