Website content has a huge impact on keyword rankings. Google judges keyword relevance based on your content, combined with backlinks, to determine your final ranking.
If your keywords are naturally distributed and you reasonably use more synonyms (Google can identify them), it improves content relevance.
For example, if your target keyword is 'AC repair', you can appropriately use related terms like 'fix air conditioner', 'AC leaking water', etc.
This alone will essentially outrank 80% of your competitor websites.
I have created a
SEO Keyword Stacking Guide — chart PDF file.
You can get it for free
Hope this helps