Reviving a dried-out blush stick can be a bit tricky, but it's not impossible. Here's a simple method you can try:

1. Heat: The first thing you need to do is to gently heat the blush stick. You can do this by using a hairdryer. Set the hairdryer to a low heat setting and gently warm the blush stick. This will help to soften the product and make it easier to work with. Be careful not to overheat it as it can melt or change the consistency of the product.

2. Mix: Once the blush stick is soft, use a clean spatula or toothpick to mix the product. This will help to distribute the oils evenly throughout the product and revive its creamy texture.

3. Cool: After you've mixed the blush stick, let it cool down. You can put it in the fridge for a few minutes to speed up the process. Once it's cool, it should be ready to use again.

Remember, this method may not work for all blush sticks, especially if they're very old or if the ingredients have separated. If the blush stick still doesn't work after trying this method, it might be time to replace it. It's also important to note that using expired or spoiled makeup can lead to skin irritations or infections, so always check the product's expiration date before using it.