Improving RPM

Following are the RPM stat of one my websites for last 29 days. Can you please suggest a way to settle the RPM above $2 ? What are the RPM you receive on an average ? Please mention your niche…
$1.61
$1.81
$1.95
$1.70
$2.13
$1.38
$2.01
$2.23
$1.70
$1.99
$1.88
$1.82
$1.50
$1.51
$1.79
$1.26
$1.93
$1.28
$2.36
$1.26
$1.22
$1.76
$1.55
$1.27
$1.60
$1.50
$1.57
$2.45
$1.37

See original post by vola