Exactly what Zed said, most of the mods for Black Ops 3 Zombies are also mods for all of the other cod zombies games. Also, getting to be a verifier/moderator of a game requires a fairly large understanding of the game and being a fairly notable figure in a community. Most communities won't just hand out that kind of role to somebody with one run of that specific game under their belt.

Mods don't do this as a job, so you should just wait like everyone else has to. There's a little disclaimer at the bottom of a run submission forum that states: "Run approval may take 1-3 weeks in some cases. You will be notified shortly."