I hear that public trackers are pretty good. But if you have a lot to upload, getting into a private tracker gets you a lot of credit, so you can download more high quality stuff.

I haven’t used anything other than 1337x for years now, it’s very active

If you’re familiar with private trackers, I have an extra invitation to one, if you want it. You can PM me.

Snowfl dot com is what I use. Just make sure to enter the exact title of the movie or tv show with correct spelling

I’d like to post some movie and TV show dumps somewhere, particularly that’ll be indexed by Torrentio

Not a Stemio user but that requirement would limit your options right? https://torrentio.strem.fun/configure

Based on that your choices are to apply for uploader status at 1337x, ThePirateBay, TorrentGalaxy (if it ever comes back up), or maybe Rutracker if you can deal with the English/Russian translation. Just getting an account at those sites may not be possible but you’ll need to try that to achieve what you want. Not sure if they’ll give you uploader status if you’re just uploading the same movie/tv content they already have.

If you don’t care about Stemio you could try uploading to BitSearch / SolidTorrents, those are DHT crawlers (same database I believe). The admin does allow people to add torrent hashes to the main database there.