Congratulations! I am currently running just one site and my current goal is $1/day. I believe everybody should go through all steps from the beginning to understand that big bucks is nothing but a big collection of $0.01. Well, you need some content, nice domain name, some SEO and a lot of work.
As far as getting back YPN -- thats just plain impossible. I wasn't banned, I was terminated from the BETA program because they didn't like the way my traffic converted to them (I used to receive lots of digg.com traffic).
Congrats on making $100 To earn $1000 or even more, you need to increase your site's traffic as traffic = $$$.
Yeah, my traffic goal is to hit 500 steady daily uniques, but since I won't be doing that anytime soon, I'm going to launch a few small sites with the goal in mind to make $1-$2/day tops, each.