Did you know Overstock.com is based in Utah? Year after year I'd audition for On-Camera commercial opportunities through my agent. And I never booked. Then, out of the blue, my Utah Agent, Vickie, let me know that Overstock.com wanted me to Be. Their. Voice. I think those three words are what many voice actors want to hear, including me.
Even though you might be told NO multiple times, I've learned that NO doesn't mean NEVER, it means NOT NOW.
That being said, having your marketing materials current and ready-to-go is a must. For years, I have been coaching and creating new voiceover demos to showcase my skills and talent. Seneca, the Roman Philosopher said, "Luck is what happens when preparation meets opportunity"