It is important to make sure that the succulent is in indirect sunlight. If you keep the succulent indoors, make sure it gets enough light. The sap can cause skin irritation. Your succulent can turn yellow from overwatering or underwatering. Too much water is the most common reason for a succulent to turn yellow. Avoid storing it in the afternoon as the scorching sun can cause the roots to lose as much water as possible. You should not water your Sempervivum until several days after it has been repotted. Let it dry before repotting. We now have some information about this cactus.