Do you ever get the feeling that nothing you do, personally, serves God and His Kingdom in any meaningful way?
You can stop fretting. It’s God who advances the Kingdom; we are only honored to be His servants.
Mark Rushdoony addresses that issue in a recent essay for Chalcedon.
https://chalcedon.edu/blog/no-heroes-in-the-kingdom-of-god
We can’t all be Martin Luther or Mother Theresa. But we can all be faithful.