Getting followers does absolutely nothing for your income. What you need to do is get traffic from the search engines.
If you need to target one specific country for a particular reason, the best way to do that is to add your blog to Google Webmaster Tools, then set the target country there.
For instance I have an Australian belly dance website, http://bellydanceoz.com, which isn't of much relevance outside Australia. So I have it set to Australia in Webmaster Tools. I still get some traffic from other countries but 90% of my traffic now comes from Oz, even though I don't have a "com.au" domain.