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.
Maybe
@Tarev 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!