If you have 100 posts and you're not making over $1,000 per month then more posts is NOT the answer!
If the site is over 1 year old, you don't have a QUANTITY problem, you have a QUALITY problem.
Go back to your old posts and check these 5 things.
1. Do you have a ranking problem or a traffic problem (or both?)
A ranking problem is when you rank position 5+.
A traffic problem is when you rank in the top 3 but nobody is searching.
A post with a ranking problem is usually easier to fix.
2. How good is your content, really?
Compare it to the top three articles in Google.
Is yours longer?
Does the intro draw you in?
Does it go into more detail?
Does it have ORIGINAL research?
Is the spelling and grammar perfect?
Does it have the right headings?
3. How good was your keyword research?
Is the main keyword something you can actually rank for?
Is your DR/DA equal to or higher than those ranking in the top 3?
If it's not (that's okay), but does your article match the query better?
4. Check your internal links.
Have you got at least 3 internal links coming to each post from relevant articles?
Are these in context and written in a way that encourages people to click them?
Have you included a variety of keywords in the anchor text?
5. Have you really gone above and beyond with each post?
Have you included your own unique images?
Have you embedded useful videos (your own or others)?
Have you created data tables, graphs or diagrams?
Fixing your existing posts might not be as fun as writing new ones...
But it's a much better use of your time and it will get you the results you need faster. 
Source: https://twitter.com/NicheSiteLady
