Your effort and work will determine how fruitful or productive you are. Most of the time change is necessary for growth and progress. You cannot change where you are unless you change what you re doing. Change is not an easy thing for humans. We are creatures of habit.
Humans resist and fight change.
This is so even when the change will make things better. This is why progress is often so slow. This is also why people often stay so long in situations and circumstances that they may not be able to handle. It's one thing to be fruitful and productive. It's another thing to multiply.