Newcomers shouldn't leave Steemit because they aren't getting noticed. That's squandering an opportunity. Instead, they should engage with the community, be patient, keep writing good material. Eventually, they will be noticed. No, 99% of us will never get to the Trending page, but we don't need to, as long as we can form our own niche. Unless they are egomaniacs and think they're entitled to the Trending page, in which case they should totally leave Steemit. :)
Steemit's curation is actually a lot better to newcomers than the likes of Reddit or Twitter. It is so good, in fact, that there's hardly any good author that has gone completely unnoticed if they stuck around for a few weeks. Can it be better still? Sure.