I think the answer is always yes.
My grandmother (who is a great-grandmother to others) has accomplished the major tasks that God created her with the potential to do. She now has stage 4 cancer in her lungs, bones, and breasts. However, she is completely at peace, because she is content with what she has accomplished in life. She has shown absolutely no remorse in regards to the situation, and I must say, it has made things much easier for us (her family). She might have 1 year left, she might have 10. I just know she's fully at peace with whatever God has planned. In this sense, it's great to feel content with oneself.
However, as a Japanese-Canadian, most of her siblings have never found Jesus Christ. She does see her cancer as one last opportunity to witness to her siblings. I guess it's possible to have a desire to work for the Lord, even when your goals have been accomplished.
You're a lot younger than my Grandma and you probably have many God-given gifts that you can harness and utilize to make the world a better place. Some of these gifts may still be undiscovered. It's great that you feel content, but at the same time, I hope you also have some sense of ambition and hope that can propel you even further!