Some of the main stuff you should be focusing on at this stage of the site is listed on this Meta post I made last week.
Additionally, one of the main things y'all should be focusing on is simply asking and answering questions — as it stands, it doesn't look like you're poised for success, in terms of sheer high-quality question volume. There are some metrics the Community Team uses to assess whether a site will be successful or not, but those aren't put front-and-center like the rest of the Area 51 process (as you mentioned) because the main focus here should be to create good content, and not to reach a specific goalpost.
Obviously, that means that there's always a judgment call from the Community Team as to whether a site makes it to public beta or not, because we need to balance quantitative criteria such as high-quality question numbers and qualitative criteria such as whether there is a core community working on doing curation tasks (such as maintaining tag wikis, editing and closing posts, etc.) and having the discussions that are important for defining community standards for how these tasks should be undertaken. We do this because the alternative makes the process more easily rigged, because folks could simply aim to have X questions with Y answers and a score of Z, instead of focusing on the actual quality of the content, and establishing a core community in the site.