Finish your book and then get back to that publisher. The publisher will know how to get feedback or will give you feedback themselves. You will certainly have to rewrite one or the other part of the book.
Yeah, I'll definitely do that when I'm done. I felt really comfortable contacting Novum Verlag and if they actually want to publish my book and the price fits, I'll probably take the option. It may be that you also have a small chance with traditional publishers, but getting published there is also very time-consuming and involves a lot of rejections.
I think very few people start writing because they want to earn money with it. First and foremost, it's about bringing your stories closer to other people or because you feel the same way when you write as you do when you read (stress is reduced, you forget about everyday life,...).
At some point you will surely reach a point where you want more. And what comes after reading, after writing - a publication.
I think you can compare it well with sports. I saw my father playing soccer, then I started playing myself. Later I earned a little money with it and at some point I wanted more. For me, this is a very natural development that happens in many areas.
This is a nice example. And yes, I also believe that this is a normal development. Most people are more or less socially inclined and it's normal to want recognition for one's achievements.