At every stage of life, no matter how young or old we are, God has valuable work for us to do, and we have the gifts that need to be carried to someone. Trust that. Listen to God whispering to you through your gifts and through the circumstances of your daily life. He'll let you know when you're done in one spot, and where you're needed next. And rest assured, you'll always be needed, because you don't just carry God's gifts: When you're at your best, you ARE God's gift, and you are very much needed!
Our great aim should be, to be deaf to self, to hearken to God in silence, to renounce every vanity, and to devote ourselves to solid virtue. Let us speak but little and do much, without a thought as to whether we are observed or not.
We should die to the flattering delights of self-love, by becoming humble and in love with obscurity and contempt, and to have a single eye to God.
Total self sacrifice is when you think you can't possibly go further in support of one you have dedicated your life to....and then you do, again and again.