Under such circumstances, it can be easy to get discouraged; to worry about your impact and your legacy. To ask, "is this all there is?" But, as 1 Peter reminds us, there is nothing we do that is truly insignificant, when we work for God's glory, instead of our own.
Each of you should use whatever gift you have received to serve others, as faithful stewards of God’s grace in its various forms. If anyone speaks, they should do so as one who speaks the very words of God. If anyone serves, they should do so with the strength God provides, so that in all things God may be praised through Jesus Christ. To him be the glory and the power for ever and ever. Amen. (1 Peter 4:10-11)
"So that in all things, God may be praised through Jesus Christ." This is a high calling. Whether you are a plumber, or a daycare worker, or working on an assembly line, or flipping burgers -- "whatever you do," says 1 Corinthians 10:31, "do it all for the glory of God."
And, because you're doing it for Him, do it to the very best of your abilities. Maybe you'll be recognized for it on earth, and maybe not. But when you do it as a form of worship -- because that's what it is -- know that you will be rewarded by Him whose rewards really matter (Colossians 3:24).
So don't be downtrodden by the drudgery of what the world says is a mundane job. Worship God in your work, and with your work. Glorify God in what you do, understanding that, when people know you are a Christian, what you do -- and how you do it -- reflects on Him. Do what you do with an attitude of service to your Savior, so those around you can, through you, experience the grace of God.