I'm going to suggest not reading books or taking courses. Things are moving so fast, the concepts of RAG as one example, that any coursework being prepared is going to be out of date quickly.

I do recommend reading academic papers coming out on AI/ML topics, however. There are some really interesting things happening in and around vector storage of documents that will be impactful for years to come.

Past that, build something cool that you are passionate about. I'm not sure your preference for size of company, but any startup that is likely to succeed will hire based on diverse work experience. Being who you are is the most important thing to remember when changing your course!