Today is the fifth Tuesday of the month, which means that my answer to this heartfelt letter is available exclusively to my Patreon patrons.
The question underneath your question is: "Am I allowed as a commercial writer to do the thing I want to do as an artist?"
I love semicolons; they're great. The issue is what you're doing with language and content that leads to the use of so many of them.
Books often change quite a lot as you're writing them and the book you've written may require a somewhat different protagonist than was called for in your original outline.