I have been learning SEO for quite a while now and also practicing it but there is something that always bothers me and that is i am never able to research a niche of my own. and by that i mean that i am not able to find unique niches like let me elaborate with an example. What i usually am able to find and search are some common niches like cancer, or gadgets or gifts for men etc, But when i usually see other people posts on groups in facebook and other forums that i am a part of they usually come up with unique stuff like "cord blood " or some other things like that with high cpc and i am usually not able to fine these kind of things.
Is there a certain method to that some kind of site source some thing to read i dont know i am just really confused and need this to get resolved and asking your help guys.
Also i will be more than happy to have niche suggestions from you guys.
As always i am open to positive criticism of any kind.