The fact is, most writers dabble in more than one genre. Some may only publish in one, but I'll bet they still play with others that never make it to publication. I can only speak for myself, but I would get very bored if I confined myself to only one setting and one time period. My main focus is on my western historicals, but to break the tedium, I occasionally go play with other works in progress.
To date, here are the alternate genres I piddle with:
So, now you know. Are you a one-genre writer, or do you also dabble in several sub-genres? If so, which ones?