The difference between being delusional and being great is that someone else recognizes the greatness in what you are doing.
As soon as one person “buys in,” it is now undeniably great, at least to one person. But because we are social animals, that one person will start to talk about it to other people, and soon a network begins to build.
At that point you know that whatever you made is providing real value to others, which is the ultimate affirmation.
This utility may have a short or long shelf life, regardless, it’s a significant achievement.
If you ever get this, take a moment to celebrate it.