Trying to improve my stories

Hello everyone! I'm the writer of Cheerleaders revenge, Victoria's new secretary, A painful debt collection and Teacher's detention.

Now I'm working on a shared universe with fictional girls from a lot of media, and Teacher's detention story but I feel my writing is becoming more static, and it isn't evolving. I fear thus will lead me to stop writing or just make worst stories, so anyone can give me feedbacks on what should I have to improve?

Also tell me if you want to see other things in my stories. I don't like castration, and I'm enjoying brutal busting mixed with sex or just erotic scenes so I want to see if there is something new I can try!

Thanks for your feedback in advance! :-D