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I'm not sure where you are in your learning progression, but find a subject that you are passionate about and write a newsletter. One fold, four pages. Print copies and place them in strategic places around town. The diner, real estate agencies, local hardware store,eytc. Do it monthly then you can ask for advertising money. Small amounts, for maybe two ads. Then grow this to a small pastime business.
Get a job, even an internship with any publisher you can find. Get coffee deliver packages, whatever you can. Once they get to know you, they might place you in a career path position.
Expand your newsletter, have guest writers, cover the local towns, local events, etc.
I am a member of the Society of Children's Book Writers and Illustrators, which has helped me make long-lasting, dynamic connections. If this isn't the genre you want to pursue, there are other groups you can join. After joining, attend conferences to help make connections in the field. One of my friends who started out as a children's picture book writer became a successful editor, while another who worked in a bookstore is now a highly sought after children's book agent. The key points are hard work, making connections, and knowing your genre well.
Best of luck!