Way under word limit for supplement?

I have a 500 world limit optional supplement required, specifically for William and Mary, and I was wondering if it’s acceptable to be way under the word limit if you feel you have everything you needed to be said. My worry is adding more feels like padding to myself and may ruin the focus of the essay possibly? Or maybe I just don’t know what to add as the prompt is very broad as well. For reference the essay I have written is around 220 words.

Maybe the fact that this supplement is after all optional may make the situation better? If there are any trusted essay readers I don’t mind sending my essay for you to take a look at as well.
Thank you!

bump

You certainly don’t have to reach the word limit if you feel like what you have described is sufficient, but I can read it if you would like

You don’t have to reach the word limit as long as you get your point across.