Would like to suggest to check your competitor back links on tools like backlinkwatch.com or seoprofiler.com
I personally use SEO profiler as its free
Also would suggest to do more on Guest blogging , Commenting , articles submission and relevant forum posting .
You can buy some links from fiverr.com . 99% is crap but 1% is really gold. If you are able top find them it will help .
Also suggest to carefully do directory or classified submission as it might impact links from bad neighbors.