Need to bust up my organic result

Respected,

I have been working for an automobile based website in India. Though it has started a year back but we have seen some refreshing back start for 1st few months. Here are some stats of how it worked.


Month , Organic Page View ,Organic Visitor / Day
July 2013 , 661 , 21
August 2013 , 4510 , 145
September 2013 , 20405 , 680
October 2013 , 43593 , 1406
November 2013 , 41380 , 1380
December 2013 , 38426 , 1239
January 2014 , 52058 , 1680
February 2014 , 53362 , 1905
March 2014 , 58114 , 1874
April 2014 , 54816 , 1827
May 2014 , 58525 , 1887

As you can see we have an upward graph for few months but since long this has been stabilized same pace. We have been adding content at better speed and of much optimum quality but nothing has helped us to change the numbers (which are same more or less).
Few other facts are:

1. Page Rank - 0
2. Alexa – 217,457
3. Avg Bounce rate –53.86
4. Page speed score– 75.4

Can you guys please suggest a reason behind this sudden stabilization of my organic traffic?