Major things to look at…
…Your weekly/monthly stats. You’re not doing enough posting right now to start looking at daily stats.
Then go into…
…and look at your all time stats.
Now, let’s look at where your traffic is coming from. If you’ve been posting to Facebook/Twitter, you should be able to tell via referrals. Also, if you are buying web ads, you can instantly tell if those are worth the money. (Not talking about Google/Facebook ads, which are pay per click, but monthly ads on sites).
Go to “referrers”
Now check out the list. Do you have any Facebook/Twitter traffic? Google?