Where am I going?

I often think about what direction my photography is going. We all question our abilities at times, but I have had the hardest time figuring out what field of photography I should specialize in. I got my start taking photos of children and families, and then I began shooting fashion and weddings. Now with an artillery of diverse photos, I need to figure out where I should direct my energy to growing the business. One thing I know is that clients go to individuals who specialize in certain services. If I needed my oil changed, do I go to Pep Boys (who does it all), or do I go to the Jiffy Lube 10 minute Oil Change(who specializes in changing oil)? Sure, Pep Boys could get the job done, but the JiffyLube would probably get the job done faster because they are specifically set up to do just oil changes. So if I specialize in high fashion, more high fashion clientele will use my services. Yet if I do it all, a prospective client will not know where my expertise lies. I must define my expertise to be a successful photographer.