Fickle people living on a very broken planet results in humans totally messing up and not valuing what should be appreciated. And it's easy to forget God does not measure success like people do. There are faithful servants of the Lord who consistently press on with the tasks God has given them even though hardly anyone notices their contribution.
Some good news regarding this injustice can be found in Hebrews 6:10. For God is not unjust to forget your work and the love that you have shown toward His name, having ministered to the saints, and still ministering. The best news: God's opinion of us is not based on whether we've been deemed successful by our peers.