Hi & welcome!
Knowing your location would be helpful. At higher latitudes, some plants that prefer mostly shade in their native habitat can need more sun. It can be difficult when reading advice/anecdotes, to compare the info to your conditions, if you don't know the origin of the anecdote. I'm in AL near FL border and put Huernia where it will get about 3-4 hours of sun in the morning. Mine looks OK, but not a plant I know well or have had for very long.
could help with rehabilitation advice. I'm not sure what to do about the particular plant from your pic either.
Best vibes for its' recovery!