It would be easier to give you some tips if I knew at least the subject of your website. What I can say without that, is to diversify your link profile and if you've already got lots of links from articles, you'd better stop and change the source of links.
You can buy some site-wide links from websites similar to yours, but don't overuse it and try to use brand anchor texts. You should also build some websites focused on the nichce in your trade and put links there. Also try to create linkable content such as reports or infographics and advertise it on social media websites. In case of reports, you can create a PDF file and upload it to websites that gather such files. The same you can do with the websites with presentations.
So, what's your site about?