How to Go About it
Trying to write in different genres can really stretch you as a writer. It's one of the best ways to improve as you can learn so much from trying different things.
The most difficult thing is always where to start. It can seem very overwhelming to write in a way you never have done before. But your writing should excite and scare you. Push yourself and don't be too harsh with the results. You may not get it right first time. All practice is good practice.
I've written in a few genres (although it's all teen fiction) but they always seem to overlap. I think in this way it would be easier to cross over to a new genre. For example, my first few novels were predominately about romance, but they had a supernatural element. This made me a little less scared when I began to write supernatural stories. This led to horror and dystopian stories. So if you're too afraid to make the jump, weave another genre in a little so that next time you feel more comfortable writing in the new genre.
If you want to dive straight in, go for it! No one has to know if you don't want them to.
A story is still a story, no matter what the genre or the plot. No one genre is best or easier/more difficult to write. Perhaps if it's too scary just carry on and pretend it's not so different from before. It still has conflict, characters, a beginning, middle and end.
The only other thing I can think to suggest is to avoid copying the classics too much. For example, if you want to try out fantasy and you've only read one fantasy novel, it's likely that your story will sound a little too much like whatever you've just read. Try reading lots of stories in the new genre you're interested in (it's really easy to do this on Movellas). This will not only give you an idea on how to go about it but also give you little ideas about where your story could go. It will also give you the one thing you really need to write in a new genre: confidence
In short: Ease yourself in, read the new genre you want to write in and don't be afraid.
What genre do you always write? What would you love to try? Share here!