Dilemma! Can I #write in more than one #genre?

  
I feel like smashing my head against the drywall. I’m trying to establish myself as an author, I have lots of ideas for short stories and novels. I have written many, many stories in both the horror and thriller genre.

However, book publishing world dictates that you should only write in one genre until you’re established enough to jump between them.

But, I want to write menacing horror stories, chilling ghost stories and teeth gritting thriller stories and publish them to my readership as me, not as me and two other aliases or pen names.

Every blog and article on the subject says: No! Stick to one genre, and if your are going to hop between, you must use a pen name and write in disguise.

Surely this only applies to those who wish to flip from horror to erotica and from suspense to rom com?

Please tell me your thoughts and beliefs, I would love to know!