After 3 years, SEO hugely changes because of core updates of google and new algorithm specially for health and care websites.
Before this happened, you got backlinks from many websites and use tags and meta keywords to increase your website keywords.
google has been floating algorithm every 6 month:
1st six month, backlinks would be important and next month, content would be important.
Another Key: when you publish an article you should have links…
New techniques for SEO