If you are making money, are you focused on a specific niche, or do you have different interests? Was it always like that, were you always focused or broad in your investments?
I'm focused on several niches, I think focusing on several niches that you know a lot about, and are generally interested in, is a great way to get started, then once you've mastered and built a nice income in those niches, move on to others and conquer them, while still building up your presence and targeted traffic in your first niches
I try to make use of diverse niches and strategies in my marketing, as there is always no hard and fast rule in internet marketing. Be sure to not place your eggs in one basket, so to speak.
Unless you have a company of people working for you, it's usually best to stick to one niche and attack it from all angles. Spreading yourself too thin is a good way to lose money (I've been there.) Even today I only operate in a few niches.