you need to be good at reporting the right stuff. Go to the rules page on gag and learn them... then when you see stuff that breaks the rules, report it. They look very highly at your report success ratio (ive been an ubermod before, and on the moderation team for years so i know). You also need to be active, which you already seem to be. Then after a while, they may message you.
I got asked to be a mod, but I turned it down cause I don't fully agree with the moderation of this site, they delete too many things I think shouldn't be deleted. I never planned on wanting to a mod, I just kept answering questions and asking my own questions, commenting when I wanted to... I don't even write MyTakes or report people.
So I think you should just keep getting involved in GAG, and try to be as helpful as possible.
Use the contact form at the bottom of each page on the site, and leave a message to the admin team that you're interested. You're a nice person you I think most fellow mods would not become unhappy when Nichole joins us :D