Why is my echeveria lilacina's leaf curl?

It could be that the plant is being over- or underwatered, that the light or temperature isn't right, or that pests like mealybugs or spider mites are affecting it. Start by taking the plant apart to check for issues. It's a good idea to move the pot with the new planting media, as the plant might not survive otherwise.

Usually this is because you missed a few of the care steps, so it's probably best to try watering it less often, say once a month. It likes dryness, so you can do that. Another problem might be too much light.