Ranking issue of home page: please suggest

I am using "best + keyword" for home page with pillar article around 2000 words. I have one more pillar article for "best + small+keyword".

Home page article:"best + keyword"
1.It is not ranking for "best + keyword" or "Keyword + Review"
2. It is ranking for secondary keywords and some long tail keywords.
3. It shows 0.7% keyword density for "best + keyword" in yoast.

Other pillar article :"best + small+keyword"
1. It is ranking for both "best + keyword" or "Keyword +…

Ranking issue of home page: please suggest