I noticed that about the last week of January, a medium/high volume competitive search term I was ranking for towards the top of page 3 on Google, I no longer rank for. Not only do I no longer rank for it, my homepage doesn't even show up ANYWHERE in the Google SERPS for that search term now! It's been like that ever since.
I did build a lot of backlinks with that exact search term anchor text pointing to my homepage when I first built my website (I didn't know any better because I was a total backlink building newbie), and now I'm wondering if Rankbrain has discovered this and took my homepage off of the SERPS completely. Also, I created a lot of backlinks on webpages that aren't really relevant to my niche when I was a newbie.
Should I go back and change the anchor text and the page all these backlinks are pointing to?