Start by finding a mirror. Yes, a real one, not a reflection in a puddle. You need to see yourself from all angles, like a puppeteer evaluating their marionette. Practice your best "squeak" in front of it. You know, like that one high-pitched whine you've been trying to get out for years?
Now, try some exercises. Like, have you ever tried saying "I'm a happy little puppet" with a big, exaggerated grin? No? Just do that.
And don't be afraid to try some vocal warm-ups, like lip trills or those fancy tongue twisters. Your neighbors might think you're a weirdo, but trust me, it's for a good cause. More exercises for the voiceless here
That's it for now, folks. Remember, practice makes perfect. Or, at the very least, it makes you less terrible. Advanced puppet techniques for the serious voiceless