Sounds like pretty depressing advice, but sometimes it's worth reading:
I’ve read a few things over the last month or so which have made me realise what a tiny step towards being an author this getting published business is. First, there was this piece from author Annabel Smith about looking for an agent when you have two published novels and a third on the way. Basically, she says, it makes no difference that you’re published. Nothing has changed, it’s still the case that no one wants you; no one cares. If you haven’t sold big, you might as well have never been published. Other authors talked about how if you haven’t sold big, it might even be an impediment to have been published – all the data about your crappy sales lives on forever on BookScan, where prospective publishers can see it and decide you’re really not worth the risk.