Just a comment about interlinking your webpages...

I try to add a section on each article I write "If you are interested in this article, You may also like..." Also I have link to a webpage with all articles on the side menu as well as a link on the top menu...I also try to incorporate links into my articles if it relates to another article I wrote..

organic traffic is fluctuating. it's usual

I went from having 20-something organic visitors a day to having 0 visitors for over 2 months now. It's not a fluctuation anymore.