Niche Marketing is very important if you want to bring more traffic to your website or blog so how you find that niche that will be profitable in terms of generating more visitors to your website or blog page.
Firstly you need to be well familiar with using tool like Google Keyword Planner , http://keywordtool.io/ , http://www.wordtracker.com/ or other similar tools or websites offering keyword research and analysis options.
Secondly you need to find that particular niche with less than 15000 avg. monthly visitors per month than you need to type that particular niche in google search engine and go down the page to see related searches this will give you a particular idea what exactly people are searching for.
Thirdly writing content based on your niche is very important focus on a variety of keywords related to your niche if you write a good article having images , figures , explanation it will definitely attract more visitors.
Lastly try to promote your post to various social media sites like facebook , twitter , etc.
