That's what leads to feelings of discontentment, worthlessness, burnout, purposelessness, and unfulfillment. God created you to experience the satisfaction of a deep and joyful relationship with Him through Christ. He has given you the Holy Spirit, who guides you into all truth and gives you His wisdom and discernment. It's through His power that you are able to shift your focus away from the temporal and onto the eternal. You can never earn or achieve a relationship with God by working at it hard enough.
Salvation is by faith alone.
That's a pretty powerful mission statement. It's the highest one there can ever be, and no earthly motivation has any weight or merit in comparison. You don't have to settle for less than the best. Ask the Lord to implant His mission in your heart and invigorate your spirit with the wonder of His love each day. You will see the love of God at work, and the satisfaction of this glorious task knows no equal this side of heaven.