My CTR went to 4 from 1 but is that it?

Hi,
Thank you all for guiding me last time and helping me take my CTR from mere 1 to 4%. But, is that it? Can I not take it further? Is there something that can be done with my ad placement? Please assess my adsense placement and comment. Thank you in advance.
my website is: http://www.freecallshub.com

 

CTR mainly depends on the niche , contents so better to improve that

 

I appreciate your commenting on my post. I know the theory but I am more interested in getting some practical points like the one I got last time to add adsense next to menu items.

 

CTR Depends on the quality of traffic a lot much, Familiar visitors ( returning visitors ) are more likely to explore your website and thus more prone to click ads. Emphasize on offering people to subscribe and thus come back later.

 

Thanks. If you see I already have a feedburner subscription with around 390 subscribers and increasing everyday.