My Top Keywords Ranking Going Down (continuously)

[seotoolshero06]

hi,
I have an affiliate website where most of my articles are about product Reviews.  And it was all going good before 15 february. After that Most of my keywords that were in top 3 places in SERP loses their position.
One of the keyword that was hurted badly after is "best coffee beans". 
I have checked the search console and their is no warning issues or something suspicious. I have improved the onpage again, fixing every issue i got from audit tools, from speed to optimize images, titles to alt text, in short everything i could or that can be improved. But still coffee beans keyword is going down every passing day. 
I am so worried and want you guys to please help me regarding this.

Thanks

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