Yeah Admins ask you to be a moderator, not the other way around.
And, based on some things, I sort of doubt they'll be asking for new mods anytime soon.
However, in case they do, just follow my "Three P's"
Productive: Be a productive member, help around the forum, help other members and just be a generally caring and helpful guy
Professionalism: Don't break the rules, when you see someone break the rules don't fix it yourself, report it to the mods. When drama happens handle it in as easy of a way as you can.
Passion: Be passionate about the forum, it's gotta be really a part of you, something you're willing to dedicate a significant portion of time to. Be an active member, post around the forum lots, just generally be passionate about your forum experience.
If you follow these three P's, then I'm sure you'll be considered if Zeph or tweak decide new mods are in order.