I know the keyword density has changed from 3-5% to 1.5~2% now. This is what google wants.
Writing an SEO article wastes a lot of time. You need to plan how to write and get all the LSI keywords before you start writing your article, then you need to bold,italic,underline your keywords in order to get attention of google that the decorated words is the ''keywords''.
Don't you see that SEO is a waste of time ? It's only 20%~30% for SEO. Backlinking stands 70%~80%.
I have seen websites with adsense without high paying keywords and SEO, earning more than 10k+ per month.