It will also be important to read other books in your own genre and try to observe the market a bit yourself. Perhaps one recognizes a trend. If you come up with a book about vampires now, you're probably a little late. That would have been great 10 years ago.
You don't have to copy other authors, but you should learn from them. How do they build characters, how do they build a story...? You learn all that in such workshops.
You could also meet with other authors. Maybe there is a kind of book club only for authors. There are also training courses in the field of writing. Maybe that would be a good idea, or you could go to the university and listen to some literature lectures.