Well if you want to go full on seed-maxing, you would get a seedbox, you would focus on most anticipated releases (popular TV shows, Movies...), you would use automation tool like autobrr to automatically grab the torrents as soon as possible, so you can start seeding as soon as possible. You would get on multiple private trackers and cross seed (download identical release from one tracker so you can seed it on another one, or multiple other ones), and you would do this because one tracker might have freeleech for a specific torrent while others don't, or stuff get released on one quicker than the others, etc. There is also a tool for automated cross-seeding (cross-seed )

If you don't want to mess with those tools, nor you have a seedbox, you would just grab freeleech torrents (TL has a lot of freeleech), you would seed them as long as possible, I only remove torrents when I need extra space, so they usually get seeded for months. And besides the upload credit you get by seeding/uploading to other peers/leechers, you also get TL points which you can exchange for more upload credit. You would take the advantage of their achievement system, they give TL points for doing tasks (like visiting the site every day for a month, downloading 10,20 movies...)
And one small extra way to get some more TL points is to wait for the new years event, where they give random amount of TL points/ VIP for few days/invites, if you visit the site each day and grab the gift while the event is active.

If you don't care about any of that, just make sure that you grab freeleech most of the time and seed as long as you can, that should be more than enough to keep your ratio above 1