Ain 't going to happen. In this case, your duckling really is what it is. It won't turn into a swan.
The soil doesn't look very bad, but I think I see signs it has been dried out in the past.
Do not put the pebbles and moss back, leave this as it is now. Reason is that now you can see how wet/dry your soil is.
Follow the care guidelines for
Carmona
Pay special attention to the watering guidelines. Water thoroughly until water comes out of the drainage hole. Then let the soil dry, but do not let it dry out completely. Empty the drip tray, do not let the pot stand in excess water.
If it doesn't improve, let us know.