It is very important to get reviews. Over the years I’ve learned that having a great book cover, a great story, and a website are simply not enough. We live in a competitive world vying with thousands of writers for the readers’ attention.
By Tracking I am speaking of tracking your book. It could be Sales, Royalties, Reviews, or something altogether different. There are a lot of methods out there and I assume they are successful, especially if they’ve been around a lot.
The real question is Am I able to Write in Multiple Genres?
Ultimately it is your audience that determines the answer to that. However, it is possible that you could end up with a different audience for each genre. In fact, I’d say that is likely that your audiences will change from genre to genre.
Breaking into a new genre (for you) can also be tough. In my case, my primary focus is writing good fiction no matter what the genre. Getting people to like my books is more a matter of marketing than anything else.