amaranthine: unfading; everlasting.
Do things that will stand the test of time.
On a micro level, it's fine to feel insignificant. In fact, it's expected.
But on a macro level - after you're able to take a step back and observe what you've been working on - make sure you're making an impact.
These types of periodic assessment will ensure that you're on track for something fulfilling. The opposite of this is getting trapped in the weeds without any understanding where you're headed.