The only thing a radio announcer and voice actor have in common is they both sit or stand in front of a microphone. However, they are two entirely separate deliveries.
When I got started in voiceovers decades ago, every script read sounded like I was doing an urgent weather update. I spent five years in radio and was groomed to sound like that. It took several months of coaching to break from the punchy "announcer" read. Another reason coaching is so important. Just because you've had several years of radio experience, it doesn't mean you're ready for a voiceover career. Forget all you learned in radio and start over by hiring a VO coach. Having the chops is one thing, but it's the acting that gets you hired.