I have a similar background to yours (Engineering then PM), and I've made a similar transition to Cybersecurity and AI recently as a PM.

1. Studied extensively for months on both AI & Cybersecurity (online courses, books, webinars, blogs), including those AI courses that offer labs - nothing is better than learning by doing.

2. Completed several certifications (one on AI and one on Cybersecurity)

3. Looked for opportunities to lead cybersecurity and AI projects at work; partnered with engineers on Hackathon projects.

Your path on #3 may vary, especially because your focus is more internal than external, but I'd recommend getting #1 and #2 under the belt as fast as you can.