The second step is to read the book through, stop as little as possible, and find out any mistakes, disorder, incoherence or ineffectiveness. Solve these. In doing so, many departments will show that they need to improve. Rewrite them, adjust them, add them, subtract them. Read it out in your head, even aloud, and find out what seems wrong.
Read the end of the book, and then come back and read it slowly. Read through it first and find out the problem. Now, the work of polishing stories and reading begins. You will need more of these transmissions, maybe every few weeks, so that your brain will forget and read something new every time.
In some cases, if you don't do a spelling check, you need to do a serious spelling check. You should also pay attention to grammar check. Then you need to look at every "we will" and turn them into "we will" at the right time. Every double word that can be turned into a single word needs to be read carefully. Lack of them will make reading more difficult and unnatural, especially in dialogue.
Then do one more step, because in the process of repairing, you have already stuffed something else. When you finally finish a manuscript without changing any main content, it's time to send it to a professional editor. You will get a lot of red, and then you will check one by one, check the suggestions, check whether you think it is correct, and make changes.
Then you proofread the whole article again and send it to professional proofreaders, who will find all kinds of problems you can't see. Another red search, change as needed, and another proofreader search for yourself because you stuffed something else.
If you can't find any problems, it's time to show this book to agents, publishers or independent publishing companies. The first book is a long learning curve, full of boring repetition, rewriting and adjustment, and shows you how badly you made some parts and what you completely ignored.
Take some time to get things done. When a book is finally published or sent to an agent/publisher, the better the book, the more likely it is to sell well or be selected.
Most people don't do enough work. Or they stop to look for what they can't see.