The whole idea of finding satisfaction by doing something itself is not correct. Satisfaction comes from deep rest, by reposing deep within oneself. When you get established within your Self, then there is contentment. The satisfaction you think that comes by doing some work is very temporary and lasts only for a short while.
If your work is successful, then you feel the need to do more work. When you get more success, then that again drives you to work more. You do not feel like stopping after having success. On the other hand, if you face some loss or failure in what you are doing, then also you feel, “Oh, how did it fail despite my efforts? I won’t give up; I will try again and succeed”. You feel challenged to do more. So you want to work more and work harder whether you get success or failure. And in this process the search for contentment continues. You keep searching for contentment when you are constantly engaged in work, or in action. It is only in knowledge that you can find your true contentment. Fulfilment or contentment lies only in wisdom, and in deep meditation; not in any work or action as such.