Hi Finnley! I like your take on the Jack the Ripper mythos. His reign of terror in Victorian era London is still a mystery to this day. The concepts in your story are quite interesting, and I am sure if you plan to make it into a full length book, you will do a great job.
As for the tips, I believe you should take your time with the writing process. When you write your settings and your characters, take the time to fill them out. You should also pace yourself, and try not to dump too much information on your readers. I believe you should double check your work after every few paragraphs. This will help you keep tabs on any misspelled words or grammatical errors you might have missed.
It might be a bit tedious to do this during your writing sessions, however, it will really ensure that your final work is in the best shape possible. I hope my tips are able to help you grow as a writer. I could tell that you are very passionate about your writing, and I believe that you already have a great start!