Yes, after bearing the Dao Fruit, one can still slowly replenish the foundation of the Dao Fruit.
However, this replenishment process requires a considerable amount of energy and time.
It's possible to be busy for three to five thousand years and only be able to make up for one aspect of it.
There are quite a few Immortals who could not complete this replenishment before the end of their lifespan drew near.
And completing the replenishment is merely the starting point.
After that, one must cultivate magic power and advance one's cultivation, which takes even more time.
How could common True Immortals have so much time to spare?
Therefore, those with unstable foundations are generally regarded in the Immortal Realm as having reached the end of their Dao.
At most, they can only enhance their magic power within their current realm. The possibility of breaking through to a higher level and ascending to a higher path, however, is nonexistent.
