Working Hard Since 5 Years But Ranking is Still Down

Hi,
I have a website https://www.theacademicpapers.co.uk/. I have been working on it since 2013 and have done lot of work on it. I had been on top positions with all keywords. However, since last year, my keyword positions were down. Since that time, I am working hard to achieve my positions even I used the best SEO techniques to recover my positions but still there is no change. The main thing is that, I have worked hard with keyword "Coursework Writing Services" "Assignment Writing...

Working Hard Since 5 Years But Ranking is Still Down WordPress ...