There are two ways to make it denser and solidify again by repeatedly adding some chocolate. Freeze or put it in the refrigerator for freezing.

Remember, the next time you dilute chocolate, you want it to be silky. Don't add milk, because after adding milk to chocolate, the color of chocolate will become dim and the texture will become sticky. It cannot be diluted. Dilute half the chocolate with butter and whipped cream.

Milk chocolate is actually not a mixture of milk and chocolate. Adding chocolate will reduce the density of its own chocolate. If you add too much, it will become chocolate sauce.

Do not use milk. There is water in milk, which can't be solidified. It is best to use milk powder.