There isn't one specific path to becoming a development editor, but there are a few things you can do to increase your chances of success. Firstly, it's important to have a strong knowledge of the publishing industry and the ins and outs of book development. Secondly, you should have excellent communication and organizational skills, as well as a keen eye for detail. Finally, it's helpful to have a strong writing background, as this will give you a better understanding of the development process.
If you're interested in becoming a development editor, one of the best things you can do is to look for internships or entry-level positions at publishing houses. This will give you a chance to learn about the industry and to see first-hand what development editors do on a day-to-day basis. Once you have a few years of experience under your belt, you can start to look for more senior positions.
Another great way to become a development editor is to get involved in the writing community. There are many online forums and groups where writers and editors interact, and getting involved in these communities can help you to make connections and learn about the development process. Finally, consider pursuing a degree or certificate in publishing, as this can give you a strong foundation in the industry and the skills you need to be successful.