I have never had any rejection, but many times I had to review my work and edit it based on the clients request. I pay close attention to what I do to reduce rejections.
AI should be used to generate ideas for your projects only, not that writers will depend on it totally. AI cannot take the place of a genuine human work.
Write on a daily basis. Have a note book and a pen with you always. Write about anything and everything, be aware of your surroundings and look for ways to generate stories from your daily experiences.