Personally I use public trackers the most and only recently private trackers for stuff in my native language.
I did setup i2p a few days ago and currently have only downloaded around ~1GB. Most of my bandwith (143 GB in / 135.5 GB out) has come from just having it in the background 24/7.
The advantages of usenet don’t really apply to me (longer retention, faster speeds, no vpn)
Streaming i find useful for checking if something is worth downloading
So I set up i2pd on my Android phone, but I’m not sure how to torrent over i2pd. Mostly I use a VPN on my phone with libretorrent. I used to seedbox most everything.
You can try using BiglyBT on android following these instructions: https://github.com/BiglySoftware/BiglyBT/wiki/I2P#user-content-biglybt-i2p-and-android
Otherwise, I’d suggest using a desktop to run i2psnark, BiglyBT, or qBittorrent and use i2pd along with those clients.
