I would say that I'm actually in a similar position. I'm just working hard and throwing my passion at the walls to see what sticks. I'm also trying to utilize my multiple passions in each post to kind of morph them together into one unique voice.

I would say, don't lose those things that reflect who you are. Some might recommend against it, but I don't think there's any harm in having a mish-mash of content. This way you might be reaching into a lot a different niches and if you stick with it eventually I'm sure you'll find what people respond to more strongly.