Many SEO experts will say an article with 300 to 500 words is best. Some may say 2500+ words articles are considered to be the best for SEO. However, the content length should depend on the topic of the content. Reach out to your competitor article to know about their word count and length of the article. Some articles require more images than text. So, before deciding the length of the article do some research on word count and length to get better results on SERP.
Read More: Why and How to Create SEO Friendly Content