Word Analysis for Niche Website

Hi,
I'm doing research for a long time. I want to build a niche website. I found these words. Should I write +500 articles about these words? The sites listed on the first page are Domain Strength 40-70.
I have a list below.
Generally the first 3 sites are old and good sites.
Ads with low competition are appearing in search results.

??

OP you need to check keywords actual competition before publishing 500 words articles.