Transitioning from game development to cybersecurity involves leveraging your existing server-side and DevOps skills, gaining hands-on experience through personal projects (like setting up and attacking your own Linux server), and specializing in a niche area of cybersecurity. Avoid rushing into a consultancy without experience; consider gaining credibility with cloud security certifications and by participating in Capture the Flag (CTF) events. Networking and real-world practice are also crucial.