Some good questions Webmasters in this situation or similar situations can ask themselves: - Is my site providing unique and compelling content? - Would most consumers find my site to be more useful than others in this space? - Am I abiding by all of Google's Webmaster Guidelines? If the answer to all of those questions is yes, then it's wise to doublecheck, then be patient / continue to develop your site. And optionally file a reinclusion request, if you've fixed issues associated with previous guideline violations.
The problem is if you (and other SEOs) don't know what the problem was then how can you "fix issues associated with previous quideline violations"?