imo, 1 terabyte upload, is generally considered good amount.

Also keep in mind to keep 1+ ratio (means you downloaded 800gb, and uploaded 1tb.)

Final decision always on the inviter, if you can convince him/her your dedication, you can be selected. good luck.

the best way to get uploads is to cross seed from public tracker if you can.
Means you download the same file from the public tracker then match the same name in the private tracker and upload there, and stop upload in public tracker. cross seeding can be tricky if you do not know how to, always keep the torrent pause, and force recheck before starting.