Sa_Sa_Mi I see you've done your best, but if you want advice, I'd be happy to give it.
First, you can do a review swap. I think you know what a review swap is, right? If you don't know, it's simply a new author exchanging reviews.
From doing a review swap, you will automatically know the shortcomings of your novel that you need to improve, and from giving reviews to other authors, you can learn a lot from reading the many books you review. Of course, you can't learn all of them, but at least you can get preferences for how to make better dialogue, compose a story plot, and so on.
Secondly, I see your book cover looks less attractive. You can change it to make it more interesting. If you are confused about finding a suitable cover, you can look for it on Pinterest and edit it from there using Canva. Later, you just need to put a disclaimer in the synopsis.
For the third and last one, you only need to actively upload chapters every week, whether it's 3 times a week or 1 chapter every day, because readers will automatically come to you, and you can't really expect to get a lot of readers instantly, right?