SEO ranking factors can change over time, as search engines update their algorithms to provide the best possible search results for users. Here are some SEO ranking factors that are no longer as important or relevant as they used to be:

1. Meta keywords tag: The meta keywords tag, which allowed website owners to specify relevant keywords for their site, is no longer used as a ranking factor by most search engines.
2. Exact match domains: Exact match domains, where the domain name exactly matches the targeted keyword, used to be considered an important factor in SEO. However, search engines have devalued their importance due to the prevalence of spammy or low-quality sites using exact match domains.
3. PageRank: PageRank, a metric developed by Google to measure the authority and quality of a web page based on its backlinks, is no longer publicly updated or used as a ranking factor.
4. Keyword density: In the past, search engines placed a lot of emphasis on the frequency of keywords on a page. However, keyword stuffing and other black-hat SEO practices made it necessary for search engines to focus on other factors, such as content relevance and quality.
5. Comment links: Comment links used to be a popular way to build backlinks, but search engines have devalued their importance due to spammy or low-quality comments.
6. Reciprocal linking: Reciprocal linking, where two websites link to each other, used to be a popular way to build backlinks. However, search engines have devalued their importance due to the potential for manipulation and abuse.

Overall, it’s important to stay up-to-date with the latest SEO trends and best practices to ensure that your site is optimized for search engine rankings.