guest blogging is one of the most promising method that is been used by msot of the SEo guys these days u should try that apart from this forum posting and links from relevant sites can work for u too
consider some basic SEO techniques which you can find from this forum. There's a lot of threads like this being posted. Try do the basic ones like blog commenting and guest blogging. guest blogging can help you in building links and also drive in traffic.
Out of all this i strongly feel that Content is the king for social bookmarking, article submission and even blog commenting. Also, you can try promoting your blog on social media platforms.