Niche Marketing Internet – Anyone have any idea how to find the profitable niche marketing internet and what would be the criterion I should look into in order to get profitable Niche Keyword?

Niche Marketing Internet seems too saturated especially on making money and internet marketing niche.

I already spent almost a month to find Niche Marketing Internet but so far no luck.

Can anyone helo me on this Niche Marketing Internet criteria I should focus on?