Harvesting yams is the way you bring home the provision you have earned through your months of work. This dream shows that the things you have tended are reaching the moment of their gathering.
The ground can be stubborn and the labor is often heavy. In some cases, the effort you put into the soil has resulted in nothing but decay. I have known the tiredness of a field that offers no yield. Well, dear, you have the patience to see a cycle through to its end.
Digging yams adds the sense of active, physical effort to the dream, showing that the harvest requires your direct involvement to be realized.
For its more general meaning: Dream about a yam
What does it mean I was digging out yam in my dream
Your dream is a signal for help and desperation. This dream means that you are expressing a desperate cry for help. There is some aspect of yourself that you are desperately trying to rid yourself of.