@AnnieG
I see this Toot due to a friend boosting it.
AFAIK, quiet public means that it won't be visible to everyone when you share it. So that could be why not many people interact with your toots, because they've not been able to easily see them on their time lines.
@FediTips has a lot of info on their website about all the settings and how the affect your visibility. While I may not have all the answers, I am almost sure that Fedi Tips will have many questions you may have already answered on their site!
Hope this helps.