Whatever you do, work heartily, as for the Lord and not for men. Colossians 3:23
Your work may be as a mother or a mechanic. It may be as a student or as a surgeon. It may be as a plumber or a pastor. Maybe your work right now is to look for work! But when you see that your work is for the Lord, it will give new meaning to whatever you do.
God has called you to this work, and in doing it, you are serving him. Other people may or may not appreciate what you do. They may or may not reward you for what you do. But if you keep in mind that you are serving him, it will help you not to be slothful or lacking in zeal, but to be fervent in Spirit because you are serving the Lord. It is the Lord we are serving. Jesus Christ is the risen Lord. He is the sovereign Lord.
It is really hard for soldiers to follow a general if they feel in their hearts that his campaign will end in failure. The good news for jaded followers of Jesus is that we know he wins! The grave was not the end for Jesus and it will not be the end for us. Evil did not overcome him, and though it may have its day, it will not overcome us.
Have you lost some zeal or passion for the work that you do? Ask the Lord to refocus your heart, so that you are working for him, not merely for men.